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postgresql-9.2.24 /
html /
[ HOME SHELL ]
Name
Size
Permission
Action
LEGALNOTICE.html
2.62
KB
-rw-r--r--
acronyms.html
15.9
KB
-rw-r--r--
admin.html
12.27
KB
-rw-r--r--
adminpack.html
7.7
KB
-rw-r--r--
app-clusterdb.html
10.35
KB
-rw-r--r--
app-createdb.html
12.55
KB
-rw-r--r--
app-createlang.html
9.67
KB
-rw-r--r--
app-createuser.html
15.27
KB
-rw-r--r--
app-dropdb.html
9.42
KB
-rw-r--r--
app-droplang.html
9.41
KB
-rw-r--r--
app-dropuser.html
9.37
KB
-rw-r--r--
app-ecpg.html
8.51
KB
-rw-r--r--
app-initdb.html
15.04
KB
-rw-r--r--
app-pg-ctl.html
21.93
KB
-rw-r--r--
app-pg-dumpall.html
20.22
KB
-rw-r--r--
app-pgbasebackup.html
19.37
KB
-rw-r--r--
app-pgconfig.html
10.83
KB
-rw-r--r--
app-pgcontroldata.html
3.89
KB
-rw-r--r--
app-pgdump.html
42.93
KB
-rw-r--r--
app-pgreceivexlog.html
10.8
KB
-rw-r--r--
app-pgresetxlog.html
11.29
KB
-rw-r--r--
app-pgrestore.html
29.56
KB
-rw-r--r--
app-postgres.html
31.08
KB
-rw-r--r--
app-postmaster.html
2.93
KB
-rw-r--r--
app-psql.html
135.62
KB
-rw-r--r--
app-reindexdb.html
11.02
KB
-rw-r--r--
app-vacuumdb.html
12.32
KB
-rw-r--r--
appendixes.html
25.71
KB
-rw-r--r--
applevel-consistency.html
10.07
KB
-rw-r--r--
archive-recovery-settings.html
7.17
KB
-rw-r--r--
arrays.html
27.42
KB
-rw-r--r--
auth-delay.html
3.69
KB
-rw-r--r--
auth-methods.html
35.35
KB
-rw-r--r--
auth-pg-hba-conf.html
29.06
KB
-rw-r--r--
auth-username-maps.html
8.4
KB
-rw-r--r--
auto-explain.html
9.66
KB
-rw-r--r--
backup-dump.html
15.55
KB
-rw-r--r--
backup-file.html
7.81
KB
-rw-r--r--
backup.html
4.38
KB
-rw-r--r--
biblio.html
11.28
KB
-rw-r--r--
bki-commands.html
9.42
KB
-rw-r--r--
bki-example.html
2.98
KB
-rw-r--r--
bki-format.html
3.38
KB
-rw-r--r--
bki-structure.html
4.22
KB
-rw-r--r--
bki.html
4.23
KB
-rw-r--r--
bookindex.html
237.47
KB
-rw-r--r--
btree-gin.html
4.49
KB
-rw-r--r--
btree-gist.html
6.72
KB
-rw-r--r--
bug-reporting.html
18.21
KB
-rw-r--r--
catalog-pg-aggregate.html
5.37
KB
-rw-r--r--
catalog-pg-am.html
10.3
KB
-rw-r--r--
catalog-pg-amop.html
7.42
KB
-rw-r--r--
catalog-pg-amproc.html
4.77
KB
-rw-r--r--
catalog-pg-attrdef.html
4.26
KB
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catalog-pg-attribute.html
10.05
KB
-rw-r--r--
catalog-pg-auth-members.html
4.16
KB
-rw-r--r--
catalog-pg-authid.html
6.66
KB
-rw-r--r--
catalog-pg-cast.html
6.79
KB
-rw-r--r--
catalog-pg-class.html
12.36
KB
-rw-r--r--
catalog-pg-collation.html
5.76
KB
-rw-r--r--
catalog-pg-constraint.html
11.31
KB
-rw-r--r--
catalog-pg-conversion.html
4.33
KB
-rw-r--r--
catalog-pg-database.html
6.86
KB
-rw-r--r--
catalog-pg-db-role-setting.htm...
3.97
KB
-rw-r--r--
catalog-pg-default-acl.html
5.14
KB
-rw-r--r--
catalog-pg-depend.html
8.43
KB
-rw-r--r--
catalog-pg-description.html
4.37
KB
-rw-r--r--
catalog-pg-enum.html
4.61
KB
-rw-r--r--
catalog-pg-extension.html
5.16
KB
-rw-r--r--
catalog-pg-foreign-data-wrappe...
4.83
KB
-rw-r--r--
catalog-pg-foreign-server.html
4.58
KB
-rw-r--r--
catalog-pg-foreign-table.html
3.94
KB
-rw-r--r--
catalog-pg-index.html
8.66
KB
-rw-r--r--
catalog-pg-inherits.html
3.8
KB
-rw-r--r--
catalog-pg-language.html
5.81
KB
-rw-r--r--
catalog-pg-largeobject-metadat...
3.54
KB
-rw-r--r--
catalog-pg-largeobject.html
5.03
KB
-rw-r--r--
catalog-pg-namespace.html
3.66
KB
-rw-r--r--
catalog-pg-opclass.html
5.73
KB
-rw-r--r--
catalog-pg-operator.html
6.49
KB
-rw-r--r--
catalog-pg-opfamily.html
4.7
KB
-rw-r--r--
catalog-pg-pltemplate.html
5.24
KB
-rw-r--r--
catalog-pg-proc.html
13.09
KB
-rw-r--r--
catalog-pg-range.html
5.06
KB
-rw-r--r--
catalog-pg-rewrite.html
5.26
KB
-rw-r--r--
catalog-pg-seclabel.html
4.41
KB
-rw-r--r--
catalog-pg-shdepend.html
6.88
KB
-rw-r--r--
catalog-pg-shdescription.html
4.15
KB
-rw-r--r--
catalog-pg-shseclabel.html
4.3
KB
-rw-r--r--
catalog-pg-statistic.html
9.31
KB
-rw-r--r--
catalog-pg-tablespace.html
4.06
KB
-rw-r--r--
catalog-pg-trigger.html
8.09
KB
-rw-r--r--
catalog-pg-ts-config-map.html
4.09
KB
-rw-r--r--
catalog-pg-ts-config.html
4.38
KB
-rw-r--r--
catalog-pg-ts-dict.html
4.61
KB
-rw-r--r--
catalog-pg-ts-parser.html
4.96
KB
-rw-r--r--
catalog-pg-ts-template.html
4.16
KB
-rw-r--r--
catalog-pg-type.html
19.44
KB
-rw-r--r--
catalog-pg-user-mapping.html
3.76
KB
-rw-r--r--
catalogs-overview.html
10.19
KB
-rw-r--r--
catalogs.html
10.14
KB
-rw-r--r--
charset.html
4.06
KB
-rw-r--r--
chkpass.html
4.29
KB
-rw-r--r--
citext.html
10.89
KB
-rw-r--r--
client-authentication-problems...
4.13
KB
-rw-r--r--
client-authentication.html
5.78
KB
-rw-r--r--
client-interfaces.html
13.4
KB
-rw-r--r--
collation.html
13.89
KB
-rw-r--r--
config-setting.html
10.88
KB
-rw-r--r--
connect-estab.html
4.21
KB
-rw-r--r--
continuous-archiving.html
48.66
KB
-rw-r--r--
contrib-dblink-build-sql-delet...
5.32
KB
-rw-r--r--
contrib-dblink-build-sql-inser...
5.91
KB
-rw-r--r--
contrib-dblink-build-sql-updat...
6.13
KB
-rw-r--r--
contrib-dblink-cancel-query.ht...
3.73
KB
-rw-r--r--
contrib-dblink-close.html
4.54
KB
-rw-r--r--
contrib-dblink-connect-u.html
4.38
KB
-rw-r--r--
contrib-dblink-connect.html
7.15
KB
-rw-r--r--
contrib-dblink-disconnect.html
3.63
KB
-rw-r--r--
contrib-dblink-error-message.h...
3.43
KB
-rw-r--r--
contrib-dblink-exec.html
5.34
KB
-rw-r--r--
contrib-dblink-fetch.html
5.84
KB
-rw-r--r--
contrib-dblink-function.html
8.43
KB
-rw-r--r--
contrib-dblink-get-connections...
3.13
KB
-rw-r--r--
contrib-dblink-get-notify.html
4.07
KB
-rw-r--r--
contrib-dblink-get-pkey.html
4.39
KB
-rw-r--r--
contrib-dblink-get-result.html
6.8
KB
-rw-r--r--
contrib-dblink-is-busy.html
3.41
KB
-rw-r--r--
contrib-dblink-open.html
5.34
KB
-rw-r--r--
contrib-dblink-send-query.html
4.07
KB
-rw-r--r--
contrib-prog-client.html
3.35
KB
-rw-r--r--
contrib-prog-server.html
3.75
KB
-rw-r--r--
contrib-prog.html
3.24
KB
-rw-r--r--
contrib-spi.html
10.97
KB
-rw-r--r--
contrib.html
8.7
KB
-rw-r--r--
creating-cluster.html
12.17
KB
-rw-r--r--
cube.html
15.57
KB
-rw-r--r--
database-roles.html
5.95
KB
-rw-r--r--
datatype-binary.html
12.59
KB
-rw-r--r--
datatype-bit.html
4.98
KB
-rw-r--r--
datatype-boolean.html
5.14
KB
-rw-r--r--
datatype-character.html
11.61
KB
-rw-r--r--
datatype-datetime.html
49.57
KB
-rw-r--r--
datatype-enum.html
6.28
KB
-rw-r--r--
datatype-geometric.html
12.21
KB
-rw-r--r--
datatype-json.html
3.36
KB
-rw-r--r--
datatype-money.html
5.35
KB
-rw-r--r--
datatype-net-types.html
10.18
KB
-rw-r--r--
datatype-numeric.html
21.83
KB
-rw-r--r--
datatype-oid.html
9.46
KB
-rw-r--r--
datatype-pseudo.html
7.11
KB
-rw-r--r--
datatype-textsearch.html
9.8
KB
-rw-r--r--
datatype-uuid.html
4.45
KB
-rw-r--r--
datatype-xml.html
11.07
KB
-rw-r--r--
datatype.html
16.22
KB
-rw-r--r--
datetime-appendix.html
3.44
KB
-rw-r--r--
datetime-config-files.html
8.77
KB
-rw-r--r--
datetime-input-rules.html
6.6
KB
-rw-r--r--
datetime-keywords.html
4.98
KB
-rw-r--r--
datetime-units-history.html
7.46
KB
-rw-r--r--
dblink.html
5.2
KB
-rw-r--r--
ddl-alter.html
10.25
KB
-rw-r--r--
ddl-basics.html
7.63
KB
-rw-r--r--
ddl-constraints.html
22.26
KB
-rw-r--r--
ddl-default.html
4.43
KB
-rw-r--r--
ddl-depend.html
6.35
KB
-rw-r--r--
ddl-foreign-data.html
4.38
KB
-rw-r--r--
ddl-inherit.html
14.95
KB
-rw-r--r--
ddl-others.html
3.01
KB
-rw-r--r--
ddl-partitioning.html
27.11
KB
-rw-r--r--
ddl-priv.html
5.92
KB
-rw-r--r--
ddl-schemas.html
17.62
KB
-rw-r--r--
ddl-system-columns.html
7.86
KB
-rw-r--r--
ddl.html
6.23
KB
-rw-r--r--
dict-int.html
4.68
KB
-rw-r--r--
dict-xsyn.html
6.33
KB
-rw-r--r--
different-replication-solution...
14.45
KB
-rw-r--r--
disk-full.html
3.43
KB
-rw-r--r--
disk-usage.html
5.53
KB
-rw-r--r--
diskusage.html
2.61
KB
-rw-r--r--
dml-delete.html
3.48
KB
-rw-r--r--
dml-insert.html
5.67
KB
-rw-r--r--
dml-returning.html
4.98
KB
-rw-r--r--
dml-update.html
5.43
KB
-rw-r--r--
dml.html
2.88
KB
-rw-r--r--
docguide-authoring.html
6.6
KB
-rw-r--r--
docguide-build.html
14.92
KB
-rw-r--r--
docguide-docbook.html
3.76
KB
-rw-r--r--
docguide-style.html
7.25
KB
-rw-r--r--
docguide-toolsets.html
20.2
KB
-rw-r--r--
docguide.html
3.54
KB
-rw-r--r--
dummy-seclabel.html
4.26
KB
-rw-r--r--
dynamic-trace.html
26.6
KB
-rw-r--r--
earthdistance.html
8.6
KB
-rw-r--r--
ecpg-commands.html
9.3
KB
-rw-r--r--
ecpg-concept.html
4.86
KB
-rw-r--r--
ecpg-connect.html
10.57
KB
-rw-r--r--
ecpg-cpp.html
9.4
KB
-rw-r--r--
ecpg-descriptors.html
34.09
KB
-rw-r--r--
ecpg-develop.html
7.78
KB
-rw-r--r--
ecpg-dynamic.html
6.36
KB
-rw-r--r--
ecpg-errors.html
25.13
KB
-rw-r--r--
ecpg-informix-compat.html
51.52
KB
-rw-r--r--
ecpg-library.html
5.66
KB
-rw-r--r--
ecpg-lo.html
5.4
KB
-rw-r--r--
ecpg-pgtypes.html
53.18
KB
-rw-r--r--
ecpg-preproc.html
8.77
KB
-rw-r--r--
ecpg-process.html
5.26
KB
-rw-r--r--
ecpg-sql-allocate-descriptor.h...
3.89
KB
-rw-r--r--
ecpg-sql-commands.html
4.59
KB
-rw-r--r--
ecpg-sql-connect.html
9.16
KB
-rw-r--r--
ecpg-sql-deallocate-descriptor...
3.68
KB
-rw-r--r--
ecpg-sql-declare.html
5.27
KB
-rw-r--r--
ecpg-sql-describe.html
4.49
KB
-rw-r--r--
ecpg-sql-disconnect.html
4.62
KB
-rw-r--r--
ecpg-sql-execute-immediate.htm...
3.79
KB
-rw-r--r--
ecpg-sql-get-descriptor.html
7.53
KB
-rw-r--r--
ecpg-sql-open.html
4.53
KB
-rw-r--r--
ecpg-sql-prepare.html
4.08
KB
-rw-r--r--
ecpg-sql-set-autocommit.html
3.25
KB
-rw-r--r--
ecpg-sql-set-connection.html
3.84
KB
-rw-r--r--
ecpg-sql-set-descriptor.html
5.38
KB
-rw-r--r--
ecpg-sql-type.html
4.91
KB
-rw-r--r--
ecpg-sql-var.html
3.46
KB
-rw-r--r--
ecpg-sql-whenever.html
4.58
KB
-rw-r--r--
ecpg-variables.html
39.34
KB
-rw-r--r--
ecpg.html
10.1
KB
-rw-r--r--
encryption-options.html
7.32
KB
-rw-r--r--
errcodes-appendix.html
36.1
KB
-rw-r--r--
error-message-reporting.html
13.79
KB
-rw-r--r--
error-style-guide.html
16.38
KB
-rw-r--r--
event-log-registration.html
4.09
KB
-rw-r--r--
executor.html
6.46
KB
-rw-r--r--
explicit-joins.html
10.76
KB
-rw-r--r--
explicit-locking.html
24.49
KB
-rw-r--r--
extend-extensions.html
31.67
KB
-rw-r--r--
extend-how.html
4.45
KB
-rw-r--r--
extend-pgxs.html
11.49
KB
-rw-r--r--
extend-type-system.html
9.87
KB
-rw-r--r--
extend.html
9.75
KB
-rw-r--r--
external-admin-tools.html
2.66
KB
-rw-r--r--
external-extensions.html
3.19
KB
-rw-r--r--
external-interfaces.html
5.38
KB
-rw-r--r--
external-pl.html
4.56
KB
-rw-r--r--
external-projects.html
2.93
KB
-rw-r--r--
fdw-callbacks.html
12.6
KB
-rw-r--r--
fdw-functions.html
4.39
KB
-rw-r--r--
fdw-helpers.html
5.85
KB
-rw-r--r--
fdw-planning.html
9.61
KB
-rw-r--r--
fdwhandler.html
3.9
KB
-rw-r--r--
features-sql-standard.html
38.19
KB
-rw-r--r--
features.html
7.39
KB
-rw-r--r--
file-fdw.html
7.53
KB
-rw-r--r--
functions-admin.html
49.21
KB
-rw-r--r--
functions-aggregate.html
21.3
KB
-rw-r--r--
functions-array.html
13.2
KB
-rw-r--r--
functions-binarystring.html
12.29
KB
-rw-r--r--
functions-bitstring.html
6.63
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-rw-r--r--
functions-comparison.html
10.39
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-rw-r--r--
functions-comparisons.html
13.21
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-rw-r--r--
functions-conditional.html
10.75
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-rw-r--r--
functions-datetime.html
47.17
KB
-rw-r--r--
functions-enum.html
5.36
KB
-rw-r--r--
functions-formatting.html
34.57
KB
-rw-r--r--
functions-geometry.html
19.87
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-rw-r--r--
functions-info.html
57.28
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-rw-r--r--
functions-json.html
3.72
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functions-logical.html
4.56
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-rw-r--r--
functions-matching.html
73.95
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functions-math.html
19.92
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functions-net.html
13.19
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-rw-r--r--
functions-range.html
10.6
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-rw-r--r--
functions-sequence.html
12.62
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-rw-r--r--
functions-srf.html
8.63
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functions-string.html
57.67
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functions-subquery.html
16
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functions-textsearch.html
20.01
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functions-trigger.html
4.44
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functions-window.html
11.8
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functions-xml.html
31.42
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-rw-r--r--
functions.html
9.71
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-rw-r--r--
fuzzystrmatch.html
7.87
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geqo-biblio.html
3.38
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-rw-r--r--
geqo-intro.html
4.31
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-rw-r--r--
geqo-intro2.html
5.5
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-rw-r--r--
geqo-pg-intro.html
8.58
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-rw-r--r--
geqo.html
3.53
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-rw-r--r--
gin-examples.html
3.24
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-rw-r--r--
gin-extensibility.html
14.06
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-rw-r--r--
gin-implementation.html
6.41
KB
-rw-r--r--
gin-intro.html
4.55
KB
-rw-r--r--
gin-limit.html
2.75
KB
-rw-r--r--
gin-tips.html
5.58
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-rw-r--r--
gin.html
2.86
KB
-rw-r--r--
gist-examples.html
3.66
KB
-rw-r--r--
gist-extensibility.html
23.78
KB
-rw-r--r--
gist-implementation.html
4
KB
-rw-r--r--
gist-intro.html
3.53
KB
-rw-r--r--
gist.html
2.62
KB
-rw-r--r--
git.html
4.46
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-rw-r--r--
high-availability.html
7.52
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-rw-r--r--
history.html
11.64
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-rw-r--r--
hot-standby.html
35.2
KB
-rw-r--r--
hstore.html
22.1
KB
-rw-r--r--
index-catalog.html
7.81
KB
-rw-r--r--
index-cost-estimation.html
9.76
KB
-rw-r--r--
index-functions.html
18.67
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-rw-r--r--
index-locking.html
7.86
KB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Declarations</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="PL/pgSQL - SQL Procedural Language" HREF="plpgsql.html"><LINK REL="PREVIOUS" TITLE="Structure of PL/pgSQL" HREF="plpgsql-structure.html"><LINK REL="NEXT" TITLE="Expressions" HREF="plpgsql-expressions.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Structure of PL/pgSQL" HREF="plpgsql-structure.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="plpgsql.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 39. <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > - <ACRONYM CLASS="ACRONYM" >SQL</ACRONYM > Procedural Language</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Expressions" HREF="plpgsql-expressions.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="PLPGSQL-DECLARATIONS" >39.3. Declarations</A ></H1 ><P > All variables used in a block must be declared in the declarations section of the block. (The only exceptions are that the loop variable of a <TT CLASS="LITERAL" >FOR</TT > loop iterating over a range of integer values is automatically declared as an integer variable, and likewise the loop variable of a <TT CLASS="LITERAL" >FOR</TT > loop iterating over a cursor's result is automatically declared as a record variable.) </P ><P > <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > variables can have any SQL data type, such as <TT CLASS="TYPE" >integer</TT >, <TT CLASS="TYPE" >varchar</TT >, and <TT CLASS="TYPE" >char</TT >. </P ><P > Here are some examples of variable declarations: </P><PRE CLASS="PROGRAMLISTING" >user_id integer; quantity numeric(5); url varchar; myrow tablename%ROWTYPE; myfield tablename.columnname%TYPE; arow RECORD;</PRE ><P> </P ><P > The general syntax of a variable declaration is: </P><PRE CLASS="SYNOPSIS" ><TT CLASS="REPLACEABLE" ><I >name</I ></TT > [<SPAN CLASS="OPTIONAL" > CONSTANT </SPAN >] <TT CLASS="REPLACEABLE" ><I >type</I ></TT > [<SPAN CLASS="OPTIONAL" > COLLATE <TT CLASS="REPLACEABLE" ><I >collation_name</I ></TT > </SPAN >] [<SPAN CLASS="OPTIONAL" > NOT NULL </SPAN >] [<SPAN CLASS="OPTIONAL" > { DEFAULT | := } <TT CLASS="REPLACEABLE" ><I >expression</I ></TT > </SPAN >];</PRE ><P> The <TT CLASS="LITERAL" >DEFAULT</TT > clause, if given, specifies the initial value assigned to the variable when the block is entered. If the <TT CLASS="LITERAL" >DEFAULT</TT > clause is not given then the variable is initialized to the <ACRONYM CLASS="ACRONYM" >SQL</ACRONYM > null value. The <TT CLASS="LITERAL" >CONSTANT</TT > option prevents the variable from being assigned to after initialization, so that its value will remain constant for the duration of the block. The <TT CLASS="LITERAL" >COLLATE</TT > option specifies a collation to use for the variable (see <A HREF="plpgsql-declarations.html#PLPGSQL-DECLARATION-COLLATION" >Section 39.3.6</A >). If <TT CLASS="LITERAL" >NOT NULL</TT > is specified, an assignment of a null value results in a run-time error. All variables declared as <TT CLASS="LITERAL" >NOT NULL</TT > must have a nonnull default value specified. </P ><P > A variable's default value is evaluated and assigned to the variable each time the block is entered (not just once per function call). So, for example, assigning <TT CLASS="LITERAL" >now()</TT > to a variable of type <TT CLASS="TYPE" >timestamp</TT > causes the variable to have the time of the current function call, not the time when the function was precompiled. </P ><P > Examples: </P><PRE CLASS="PROGRAMLISTING" >quantity integer DEFAULT 32; url varchar := 'http://mysite.com'; user_id CONSTANT integer := 10;</PRE ><P> </P ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="PLPGSQL-DECLARATION-PARAMETERS" >39.3.1. Declaring Function Parameters</A ></H2 ><P > Parameters passed to functions are named with the identifiers <TT CLASS="LITERAL" >$1</TT >, <TT CLASS="LITERAL" >$2</TT >, etc. Optionally, aliases can be declared for <TT CLASS="LITERAL" >$<TT CLASS="REPLACEABLE" ><I >n</I ></TT ></TT > parameter names for increased readability. Either the alias or the numeric identifier can then be used to refer to the parameter value. </P ><P > There are two ways to create an alias. The preferred way is to give a name to the parameter in the <TT CLASS="COMMAND" >CREATE FUNCTION</TT > command, for example: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION sales_tax(subtotal real) RETURNS real AS $$ BEGIN RETURN subtotal * 0.06; END; $$ LANGUAGE plpgsql;</PRE ><P> The other way, which was the only way available before <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > 8.0, is to explicitly declare an alias, using the declaration syntax </P><PRE CLASS="SYNOPSIS" ><TT CLASS="REPLACEABLE" ><I >name</I ></TT > ALIAS FOR $<TT CLASS="REPLACEABLE" ><I >n</I ></TT >;</PRE ><P> The same example in this style looks like: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION sales_tax(real) RETURNS real AS $$ DECLARE subtotal ALIAS FOR $1; BEGIN RETURN subtotal * 0.06; END; $$ LANGUAGE plpgsql;</PRE ><P> </P ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Note: </B > These two examples are not perfectly equivalent. In the first case, <TT CLASS="LITERAL" >subtotal</TT > could be referenced as <TT CLASS="LITERAL" >sales_tax.subtotal</TT >, but in the second case it could not. (Had we attached a label to the inner block, <TT CLASS="LITERAL" >subtotal</TT > could be qualified with that label, instead.) </P ></BLOCKQUOTE ></DIV ><P > Some more examples: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION instr(varchar, integer) RETURNS integer AS $$ DECLARE v_string ALIAS FOR $1; index ALIAS FOR $2; BEGIN -- some computations using v_string and index here END; $$ LANGUAGE plpgsql; CREATE FUNCTION concat_selected_fields(in_t sometablename) RETURNS text AS $$ BEGIN RETURN in_t.f1 || in_t.f3 || in_t.f5 || in_t.f7; END; $$ LANGUAGE plpgsql;</PRE ><P> </P ><P > When a <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > function is declared with output parameters, the output parameters are given <TT CLASS="LITERAL" >$<TT CLASS="REPLACEABLE" ><I >n</I ></TT ></TT > names and optional aliases in just the same way as the normal input parameters. An output parameter is effectively a variable that starts out NULL; it should be assigned to during the execution of the function. The final value of the parameter is what is returned. For instance, the sales-tax example could also be done this way: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION sales_tax(subtotal real, OUT tax real) AS $$ BEGIN tax := subtotal * 0.06; END; $$ LANGUAGE plpgsql;</PRE ><P> Notice that we omitted <TT CLASS="LITERAL" >RETURNS real</TT > — we could have included it, but it would be redundant. </P ><P > Output parameters are most useful when returning multiple values. A trivial example is: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION sum_n_product(x int, y int, OUT sum int, OUT prod int) AS $$ BEGIN sum := x + y; prod := x * y; END; $$ LANGUAGE plpgsql;</PRE ><P> As discussed in <A HREF="xfunc-sql.html#XFUNC-OUTPUT-PARAMETERS" >Section 35.4.4</A >, this effectively creates an anonymous record type for the function's results. If a <TT CLASS="LITERAL" >RETURNS</TT > clause is given, it must say <TT CLASS="LITERAL" >RETURNS record</TT >. </P ><P > Another way to declare a <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > function is with <TT CLASS="LITERAL" >RETURNS TABLE</TT >, for example: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION extended_sales(p_itemno int) RETURNS TABLE(quantity int, total numeric) AS $$ BEGIN RETURN QUERY SELECT s.quantity, s.quantity * s.price FROM sales AS s WHERE s.itemno = p_itemno; END; $$ LANGUAGE plpgsql;</PRE ><P> This is exactly equivalent to declaring one or more <TT CLASS="LITERAL" >OUT</TT > parameters and specifying <TT CLASS="LITERAL" >RETURNS SETOF <TT CLASS="REPLACEABLE" ><I >sometype</I ></TT ></TT >. </P ><P > When the return type of a <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > function is declared as a polymorphic type (<TT CLASS="TYPE" >anyelement</TT >, <TT CLASS="TYPE" >anyarray</TT >, <TT CLASS="TYPE" >anynonarray</TT >, <TT CLASS="TYPE" >anyenum</TT >, or <TT CLASS="TYPE" >anyrange</TT >), a special parameter <TT CLASS="LITERAL" >$0</TT > is created. Its data type is the actual return type of the function, as deduced from the actual input types (see <A HREF="extend-type-system.html#EXTEND-TYPES-POLYMORPHIC" >Section 35.2.5</A >). This allows the function to access its actual return type as shown in <A HREF="plpgsql-declarations.html#PLPGSQL-DECLARATION-TYPE" >Section 39.3.3</A >. <TT CLASS="LITERAL" >$0</TT > is initialized to null and can be modified by the function, so it can be used to hold the return value if desired, though that is not required. <TT CLASS="LITERAL" >$0</TT > can also be given an alias. For example, this function works on any data type that has a <TT CLASS="LITERAL" >+</TT > operator: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION add_three_values(v1 anyelement, v2 anyelement, v3 anyelement) RETURNS anyelement AS $$ DECLARE result ALIAS FOR $0; BEGIN result := v1 + v2 + v3; RETURN result; END; $$ LANGUAGE plpgsql;</PRE ><P> </P ><P > The same effect can be had by declaring one or more output parameters as polymorphic types. In this case the special <TT CLASS="LITERAL" >$0</TT > parameter is not used; the output parameters themselves serve the same purpose. For example: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION add_three_values(v1 anyelement, v2 anyelement, v3 anyelement, OUT sum anyelement) AS $$ BEGIN sum := v1 + v2 + v3; END; $$ LANGUAGE plpgsql;</PRE ><P> </P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="PLPGSQL-DECLARATION-ALIAS" >39.3.2. <TT CLASS="LITERAL" >ALIAS</TT ></A ></H2 ><PRE CLASS="SYNOPSIS" ><TT CLASS="REPLACEABLE" ><I >newname</I ></TT > ALIAS FOR <TT CLASS="REPLACEABLE" ><I >oldname</I ></TT >;</PRE ><P > The <TT CLASS="LITERAL" >ALIAS</TT > syntax is more general than is suggested in the previous section: you can declare an alias for any variable, not just function parameters. The main practical use for this is to assign a different name for variables with predetermined names, such as <TT CLASS="VARNAME" >NEW</TT > or <TT CLASS="VARNAME" >OLD</TT > within a trigger procedure. </P ><P > Examples: </P><PRE CLASS="PROGRAMLISTING" >DECLARE prior ALIAS FOR old; updated ALIAS FOR new;</PRE ><P> </P ><P > Since <TT CLASS="LITERAL" >ALIAS</TT > creates two different ways to name the same object, unrestricted use can be confusing. It's best to use it only for the purpose of overriding predetermined names. </P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="PLPGSQL-DECLARATION-TYPE" >39.3.3. Copying Types</A ></H2 ><PRE CLASS="SYNOPSIS" ><TT CLASS="REPLACEABLE" ><I >variable</I ></TT >%TYPE</PRE ><P > <TT CLASS="LITERAL" >%TYPE</TT > provides the data type of a variable or table column. You can use this to declare variables that will hold database values. For example, let's say you have a column named <TT CLASS="LITERAL" >user_id</TT > in your <TT CLASS="LITERAL" >users</TT > table. To declare a variable with the same data type as <TT CLASS="LITERAL" >users.user_id</TT > you write: </P><PRE CLASS="PROGRAMLISTING" >user_id users.user_id%TYPE;</PRE ><P> </P ><P > By using <TT CLASS="LITERAL" >%TYPE</TT > you don't need to know the data type of the structure you are referencing, and most importantly, if the data type of the referenced item changes in the future (for instance: you change the type of <TT CLASS="LITERAL" >user_id</TT > from <TT CLASS="TYPE" >integer</TT > to <TT CLASS="TYPE" >real</TT >), you might not need to change your function definition. </P ><P > <TT CLASS="LITERAL" >%TYPE</TT > is particularly valuable in polymorphic functions, since the data types needed for internal variables can change from one call to the next. Appropriate variables can be created by applying <TT CLASS="LITERAL" >%TYPE</TT > to the function's arguments or result placeholders. </P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="PLPGSQL-DECLARATION-ROWTYPES" >39.3.4. Row Types</A ></H2 ><PRE CLASS="SYNOPSIS" ><TT CLASS="REPLACEABLE" ><I >name</I ></TT > <TT CLASS="REPLACEABLE" ><I >table_name</I ></TT ><TT CLASS="LITERAL" >%ROWTYPE</TT >; <TT CLASS="REPLACEABLE" ><I >name</I ></TT > <TT CLASS="REPLACEABLE" ><I >composite_type_name</I ></TT >;</PRE ><P > A variable of a composite type is called a <I CLASS="FIRSTTERM" >row</I > variable (or <I CLASS="FIRSTTERM" >row-type</I > variable). Such a variable can hold a whole row of a <TT CLASS="COMMAND" >SELECT</TT > or <TT CLASS="COMMAND" >FOR</TT > query result, so long as that query's column set matches the declared type of the variable. The individual fields of the row value are accessed using the usual dot notation, for example <TT CLASS="LITERAL" >rowvar.field</TT >. </P ><P > A row variable can be declared to have the same type as the rows of an existing table or view, by using the <TT CLASS="REPLACEABLE" ><I >table_name</I ></TT ><TT CLASS="LITERAL" >%ROWTYPE</TT > notation; or it can be declared by giving a composite type's name. (Since every table has an associated composite type of the same name, it actually does not matter in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > whether you write <TT CLASS="LITERAL" >%ROWTYPE</TT > or not. But the form with <TT CLASS="LITERAL" >%ROWTYPE</TT > is more portable.) </P ><P > Parameters to a function can be composite types (complete table rows). In that case, the corresponding identifier <TT CLASS="LITERAL" >$<TT CLASS="REPLACEABLE" ><I >n</I ></TT ></TT > will be a row variable, and fields can be selected from it, for example <TT CLASS="LITERAL" >$1.user_id</TT >. </P ><P > Only the user-defined columns of a table row are accessible in a row-type variable, not the OID or other system columns (because the row could be from a view). The fields of the row type inherit the table's field size or precision for data types such as <TT CLASS="TYPE" >char(<TT CLASS="REPLACEABLE" ><I >n</I ></TT >)</TT >. </P ><P > Here is an example of using composite types. <TT CLASS="STRUCTNAME" >table1</TT > and <TT CLASS="STRUCTNAME" >table2</TT > are existing tables having at least the mentioned fields: </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION merge_fields(t_row table1) RETURNS text AS $$ DECLARE t2_row table2%ROWTYPE; BEGIN SELECT * INTO t2_row FROM table2 WHERE ... ; RETURN t_row.f1 || t2_row.f3 || t_row.f5 || t2_row.f7; END; $$ LANGUAGE plpgsql; SELECT merge_fields(t.*) FROM table1 t WHERE ... ;</PRE ><P> </P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="PLPGSQL-DECLARATION-RECORDS" >39.3.5. Record Types</A ></H2 ><PRE CLASS="SYNOPSIS" ><TT CLASS="REPLACEABLE" ><I >name</I ></TT > RECORD;</PRE ><P > Record variables are similar to row-type variables, but they have no predefined structure. They take on the actual row structure of the row they are assigned during a <TT CLASS="COMMAND" >SELECT</TT > or <TT CLASS="COMMAND" >FOR</TT > command. The substructure of a record variable can change each time it is assigned to. A consequence of this is that until a record variable is first assigned to, it has no substructure, and any attempt to access a field in it will draw a run-time error. </P ><P > Note that <TT CLASS="LITERAL" >RECORD</TT > is not a true data type, only a placeholder. One should also realize that when a <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > function is declared to return type <TT CLASS="TYPE" >record</TT >, this is not quite the same concept as a record variable, even though such a function might use a record variable to hold its result. In both cases the actual row structure is unknown when the function is written, but for a function returning <TT CLASS="TYPE" >record</TT > the actual structure is determined when the calling query is parsed, whereas a record variable can change its row structure on-the-fly. </P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="PLPGSQL-DECLARATION-COLLATION" >39.3.6. Collation of <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > Variables</A ></H2 ><P > When a <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN > function has one or more parameters of collatable data types, a collation is identified for each function call depending on the collations assigned to the actual arguments, as described in <A HREF="collation.html" >Section 22.2</A >. If a collation is successfully identified (i.e., there are no conflicts of implicit collations among the arguments) then all the collatable parameters are treated as having that collation implicitly. This will affect the behavior of collation-sensitive operations within the function. For example, consider </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION less_than(a text, b text) RETURNS boolean AS $$ BEGIN RETURN a < b; END; $$ LANGUAGE plpgsql; SELECT less_than(text_field_1, text_field_2) FROM table1; SELECT less_than(text_field_1, text_field_2 COLLATE "C") FROM table1;</PRE ><P> The first use of <CODE CLASS="FUNCTION" >less_than</CODE > will use the common collation of <TT CLASS="STRUCTFIELD" >text_field_1</TT > and <TT CLASS="STRUCTFIELD" >text_field_2</TT > for the comparison, while the second use will use <TT CLASS="LITERAL" >C</TT > collation. </P ><P > Furthermore, the identified collation is also assumed as the collation of any local variables that are of collatable types. Thus this function would not work any differently if it were written as </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION less_than(a text, b text) RETURNS boolean AS $$ DECLARE local_a text := a; local_b text := b; BEGIN RETURN local_a < local_b; END; $$ LANGUAGE plpgsql;</PRE ><P> </P ><P > If there are no parameters of collatable data types, or no common collation can be identified for them, then parameters and local variables use the default collation of their data type (which is usually the database's default collation, but could be different for variables of domain types). </P ><P > A local variable of a collatable data type can have a different collation associated with it by including the <TT CLASS="LITERAL" >COLLATE</TT > option in its declaration, for example </P><PRE CLASS="PROGRAMLISTING" >DECLARE local_a text COLLATE "en_US";</PRE ><P> This option overrides the collation that would otherwise be given to the variable according to the rules above. </P ><P > Also, of course explicit <TT CLASS="LITERAL" >COLLATE</TT > clauses can be written inside a function if it is desired to force a particular collation to be used in a particular operation. For example, </P><PRE CLASS="PROGRAMLISTING" >CREATE FUNCTION less_than_c(a text, b text) RETURNS boolean AS $$ BEGIN RETURN a < b COLLATE "C"; END; $$ LANGUAGE plpgsql;</PRE ><P> This overrides the collations associated with the table columns, parameters, or local variables used in the expression, just as would happen in a plain SQL command. </P ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="plpgsql-structure.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="plpgsql-expressions.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Structure of <SPAN CLASS="APPLICATION" >PL/pgSQL</SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="plpgsql.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Expressions</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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