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📄 ABORT.7(2.17 KB)
📄 ALTER_AGGREGATE.7(4.97 KB)
📄 ALTER_COLLATION.7(2.8 KB)
📄 ALTER_CONVERSION.7(2.89 KB)
📄 ALTER_DATABASE.7(5.71 KB)
📄 ALTER_DEFAULT_PRIVILEGES.7(6.34 KB)
📄 ALTER_DOMAIN.7(6.96 KB)
📄 ALTER_EVENT_TRIGGER.7(2.42 KB)
📄 ALTER_EXTENSION.7(6.89 KB)
📄 ALTER_FOREIGN_DATA_WRAPPER.7(4.56 KB)
📄 ALTER_FOREIGN_TABLE.7(12.8 KB)
📄 ALTER_FUNCTION.7(8.26 KB)
📄 ALTER_GROUP.7(3.08 KB)
📄 ALTER_INDEX.7(5.59 KB)
📄 ALTER_LANGUAGE.7(2.1 KB)
📄 ALTER_LARGE_OBJECT.7(1.97 KB)
📄 ALTER_MATERIALIZED_VIEW.7(4.66 KB)
📄 ALTER_OPERATOR.7(3.67 KB)
📄 ALTER_OPERATOR_CLASS.7(2.86 KB)
📄 ALTER_OPERATOR_FAMILY.7(9.12 KB)
📄 ALTER_POLICY.7(2.88 KB)
📄 ALTER_ROLE.7(9.04 KB)
📄 ALTER_RULE.7(2.21 KB)
📄 ALTER_SCHEMA.7(2.31 KB)
📄 ALTER_SEQUENCE.7(7.53 KB)
📄 ALTER_SERVER.7(3.41 KB)
📄 ALTER_SYSTEM.7(3.8 KB)
📄 ALTER_TABLE.7(35.2 KB)
📄 ALTER_TABLESPACE.7(3.35 KB)
📄 ALTER_TEXT_SEARCH_CONFIGURATION.7(4.79 KB)
📄 ALTER_TEXT_SEARCH_DICTIONARY.7(4.02 KB)
📄 ALTER_TEXT_SEARCH_PARSER.7(2.23 KB)
📄 ALTER_TEXT_SEARCH_TEMPLATE.7(2.26 KB)
📄 ALTER_TRIGGER.7(2.98 KB)
📄 ALTER_TYPE.7(7.15 KB)
📄 ALTER_USER.7(2.66 KB)
📄 ALTER_USER_MAPPING.7(3.26 KB)
📄 ALTER_VIEW.7(4.67 KB)
📄 ANALYZE.7(7.67 KB)
📄 BEGIN.7(4.06 KB)
📄 CHECKPOINT.7(2.29 KB)
📄 CLOSE.7(2.72 KB)
📄 CLUSTER.7(6.23 KB)
📄 COMMENT.7(10.2 KB)
📄 COMMIT.7(2.1 KB)
📄 COMMIT_PREPARED.7(2.58 KB)
📄 COPY.7(29.88 KB)
📄 CREATE_ACCESS_METHOD.7(2.9 KB)
📄 CREATE_AGGREGATE.7(23.35 KB)
📄 CREATE_CAST.7(13.55 KB)
📄 CREATE_COLLATION.7(3.97 KB)
📄 CREATE_CONVERSION.7(3.78 KB)
📄 CREATE_DATABASE.7(8.48 KB)
📄 CREATE_DOMAIN.7(6.52 KB)
📄 CREATE_EVENT_TRIGGER.7(3.74 KB)
📄 CREATE_EXTENSION.7(6.57 KB)
📄 CREATE_FOREIGN_DATA_WRAPPER.7(4.96 KB)
📄 CREATE_FOREIGN_TABLE.7(9 KB)
📄 CREATE_FUNCTION.7(24.73 KB)
📄 CREATE_GROUP.7(2.11 KB)
📄 CREATE_INDEX.7(19.56 KB)
📄 CREATE_LANGUAGE.7(9.83 KB)
📄 CREATE_MATERIALIZED_VIEW.7(4.21 KB)
📄 CREATE_OPERATOR.7(6.88 KB)
📄 CREATE_OPERATOR_CLASS.7(8.52 KB)
📄 CREATE_OPERATOR_FAMILY.7(3.6 KB)
📄 CREATE_POLICY.7(15.92 KB)
📄 CREATE_ROLE.7(12.69 KB)
📄 CREATE_RULE.7(8.63 KB)
📄 CREATE_SCHEMA.7(6.15 KB)
📄 CREATE_SEQUENCE.7(9.79 KB)
📄 CREATE_SERVER.7(3.63 KB)
📄 CREATE_TABLE.7(42.1 KB)
📄 CREATE_TABLESPACE.7(4.47 KB)
📄 CREATE_TABLE_AS.7(7.8 KB)
📄 CREATE_TEXT_SEARCH_CONFIGURATION.7(3.19 KB)
📄 CREATE_TEXT_SEARCH_DICTIONARY.7(3.34 KB)
📄 CREATE_TEXT_SEARCH_PARSER.7(3.56 KB)
📄 CREATE_TEXT_SEARCH_TEMPLATE.7(3.38 KB)
📄 CREATE_TRANSFORM.7(5.79 KB)
📄 CREATE_TRIGGER.7(16.3 KB)
📄 CREATE_TYPE.7(28.96 KB)
📄 CREATE_USER.7(2.45 KB)
📄 CREATE_USER_MAPPING.7(3.27 KB)
📄 CREATE_VIEW.7(14.63 KB)
📄 DEALLOCATE.7(1.98 KB)
📄 DECLARE.7(10.22 KB)
📄 DELETE.7(7.36 KB)
📄 DISCARD.7(2.81 KB)
📄 DO.7(3.08 KB)
📄 DROP_ACCESS_METHOD.7(2.35 KB)
📄 DROP_AGGREGATE.7(3.8 KB)
📄 DROP_CAST.7(2.26 KB)
📄 DROP_COLLATION.7(2.42 KB)
📄 DROP_CONVERSION.7(2.36 KB)
📄 DROP_DATABASE.7(2.38 KB)
📄 DROP_DOMAIN.7(2.34 KB)
📄 DROP_EVENT_TRIGGER.7(2.38 KB)
📄 DROP_EXTENSION.7(2.73 KB)
📄 DROP_FOREIGN_DATA_WRAPPER.7(2.61 KB)
📄 DROP_FOREIGN_TABLE.7(2.59 KB)
📄 DROP_FUNCTION.7(3.35 KB)
📄 DROP_GROUP.7(1.57 KB)
📄 DROP_INDEX.7(3.08 KB)
📄 DROP_LANGUAGE.7(2.86 KB)
📄 DROP_MATERIALIZED_VIEW.7(2.64 KB)
📄 DROP_OPERATOR.7(3.01 KB)
📄 DROP_OPERATOR_CLASS.7(3.48 KB)
📄 DROP_OPERATOR_FAMILY.7(3.24 KB)
📄 DROP_OWNED.7(3.14 KB)
📄 DROP_POLICY.7(2.53 KB)
📄 DROP_ROLE.7(3.05 KB)
📄 DROP_RULE.7(2.35 KB)
📄 DROP_SCHEMA.7(2.76 KB)
📄 DROP_SEQUENCE.7(2.46 KB)
📄 DROP_SERVER.7(2.39 KB)
📄 DROP_TABLE.7(2.97 KB)
📄 DROP_TABLESPACE.7(2.48 KB)
📄 DROP_TEXT_SEARCH_CONFIGURATION.7(2.83 KB)
📄 DROP_TEXT_SEARCH_DICTIONARY.7(2.75 KB)
📄 DROP_TEXT_SEARCH_PARSER.7(2.66 KB)
📄 DROP_TEXT_SEARCH_TEMPLATE.7(2.69 KB)
📄 DROP_TRANSFORM.7(2.59 KB)
📄 DROP_TRIGGER.7(2.6 KB)
📄 DROP_TYPE.7(2.53 KB)
📄 DROP_USER.7(1.65 KB)
📄 DROP_USER_MAPPING.7(2.56 KB)
📄 DROP_VIEW.7(2.43 KB)
📄 END.7(2.19 KB)
📄 EXECUTE.7(2.9 KB)
📄 EXPLAIN.7(13.03 KB)
📄 FETCH.7(8.48 KB)
📄 GRANT.7(21.29 KB)
📄 IMPORT_FOREIGN_SCHEMA.7(3.98 KB)
📄 INSERT.7(19.61 KB)
📄 LISTEN.7(3.51 KB)
📄 LOAD.7(2.54 KB)
📄 LOCK.7(8.01 KB)
📄 MOVE.7(2.92 KB)
📄 NOTIFY.7(8.21 KB)
📄 PREPARE.7(8.2 KB)
📄 PREPARE_TRANSACTION.7(5.74 KB)
📄 REASSIGN_OWNED.7(3.01 KB)
📄 REFRESH_MATERIALIZED_VIEW.7(3.92 KB)
📄 REINDEX.7(7.69 KB)
📄 RELEASE_SAVEPOINT.7(3 KB)
📄 RESET.7(2.93 KB)
📄 REVOKE.7(10.44 KB)
📄 ROLLBACK.7(2.09 KB)
📄 ROLLBACK_PREPARED.7(2.6 KB)
📄 ROLLBACK_TO_SAVEPOINT.7(3.94 KB)
📄 SAVEPOINT.7(3.5 KB)
📄 SECURITY_LABEL.7(5.39 KB)
📄 SELECT.7(63.33 KB)
📄 SELECT_INTO.7(4.37 KB)
📄 SET.7(7.57 KB)
📄 SET_CONSTRAINTS.7(4.48 KB)
📄 SET_ROLE.7(4.36 KB)
📄 SET_SESSION_AUTHORIZATION.7(3.88 KB)
📄 SET_TRANSACTION.7(8.27 KB)
📄 SHOW.7(4.22 KB)
📄 START_TRANSACTION.7(2.9 KB)
📄 TABLE.7(18 B)
📄 TRUNCATE.7(6.39 KB)
📄 UNLISTEN.7(2.75 KB)
📄 UPDATE.7(12.26 KB)
📄 VACUUM.7(7.92 KB)
📄 VALUES.7(6.94 KB)
📄 WITH.7(18 B)

Editing: CREATE_OPERATOR.7

'\" t
.\"     Title: CREATE OPERATOR
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2018
.\"    Manual: PostgreSQL 9.6.9 Documentation
.\"    Source: PostgreSQL 9.6.9
.\"  Language: English
.\"
.TH "CREATE OPERATOR" "7" "2018" "PostgreSQL 9.6.9" "PostgreSQL 9.6.9 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
CREATE_OPERATOR \- define a new operator
.SH "SYNOPSIS"
.sp
.nf
CREATE OPERATOR \fIname\fR (
    PROCEDURE = \fIfunction_name\fR
    [, LEFTARG = \fIleft_type\fR ] [, RIGHTARG = \fIright_type\fR ]
    [, COMMUTATOR = \fIcom_op\fR ] [, NEGATOR = \fIneg_op\fR ]
    [, RESTRICT = \fIres_proc\fR ] [, JOIN = \fIjoin_proc\fR ]
    [, HASHES ] [, MERGES ]
)
.fi
.SH "DESCRIPTION"
.PP
\fBCREATE OPERATOR\fR
defines a new operator,
\fIname\fR\&. The user who defines an operator becomes its owner\&. If a schema name is given then the operator is created in the specified schema\&. Otherwise it is created in the current schema\&.
.PP
The operator name is a sequence of up to
NAMEDATALEN\-1 (63 by default) characters from the following list:
.sp
.if n \{\
.RS 4
.\}
.nf
+ \- * / < > = ~ ! @ # % ^ & | ` ?
.fi
.if n \{\
.RE
.\}
.sp
There are a few restrictions on your choice of name:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\-\-
and
/*
cannot appear anywhere in an operator name, since they will be taken as the start of a comment\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
A multicharacter operator name cannot end in
+
or
\-, unless the name also contains at least one of these characters:
.sp
.if n \{\
.RS 4
.\}
.nf
~ ! @ # % ^ & | ` ?
.fi
.if n \{\
.RE
.\}
.sp
For example,
@\-
is an allowed operator name, but
*\-
is not\&. This restriction allows
PostgreSQL
to parse SQL\-compliant commands without requiring spaces between tokens\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The use of
=>
as an operator name is deprecated\&. It may be disallowed altogether in a future release\&.
.RE
.PP
The operator
!=
is mapped to
<>
on input, so these two names are always equivalent\&.
.PP
At least one of
LEFTARG
and
RIGHTARG
must be defined\&. For binary operators, both must be defined\&. For right unary operators, only
LEFTARG
should be defined, while for left unary operators only
RIGHTARG
should be defined\&.
.PP
The
\fIfunction_name\fR
procedure must have been previously defined using
\fBCREATE FUNCTION\fR
and must be defined to accept the correct number of arguments (either one or two) of the indicated types\&.
.PP
The other clauses specify optional operator optimization clauses\&. Their meaning is detailed in
Section 36.13, \(lqOperator Optimization Information\(rq, in the documentation\&.
.PP
To be able to create an operator, you must have
USAGE
privilege on the argument types and the return type, as well as
EXECUTE
privilege on the underlying function\&. If a commutator or negator operator is specified, you must own these operators\&.
.SH "PARAMETERS"
.PP
\fIname\fR
.RS 4
The name of the operator to be defined\&. See above for allowable characters\&. The name can be schema\-qualified, for example
CREATE OPERATOR myschema\&.+ (\&.\&.\&.)\&. If not, then the operator is created in the current schema\&. Two operators in the same schema can have the same name if they operate on different data types\&. This is called
overloading\&.
.RE
.PP
\fIfunction_name\fR
.RS 4
The function used to implement this operator\&.
.RE
.PP
\fIleft_type\fR
.RS 4
The data type of the operator\*(Aqs left operand, if any\&. This option would be omitted for a left\-unary operator\&.
.RE
.PP
\fIright_type\fR
.RS 4
The data type of the operator\*(Aqs right operand, if any\&. This option would be omitted for a right\-unary operator\&.
.RE
.PP
\fIcom_op\fR
.RS 4
The commutator of this operator\&.
.RE
.PP
\fIneg_op\fR
.RS 4
The negator of this operator\&.
.RE
.PP
\fIres_proc\fR
.RS 4
The restriction selectivity estimator function for this operator\&.
.RE
.PP
\fIjoin_proc\fR
.RS 4
The join selectivity estimator function for this operator\&.
.RE
.PP
HASHES
.RS 4
Indicates this operator can support a hash join\&.
.RE
.PP
MERGES
.RS 4
Indicates this operator can support a merge join\&.
.RE
.PP
To give a schema\-qualified operator name in
\fIcom_op\fR
or the other optional arguments, use the
OPERATOR()
syntax, for example:
.sp
.if n \{\
.RS 4
.\}
.nf
COMMUTATOR = OPERATOR(myschema\&.===) ,
.fi
.if n \{\
.RE
.\}
.SH "NOTES"
.PP
Refer to
Section 36.12, \(lqUser-defined Operators\(rq, in the documentation
for further information\&.
.PP
It is not possible to specify an operator\*(Aqs lexical precedence in
\fBCREATE OPERATOR\fR, because the parser\*(Aqs precedence behavior is hard\-wired\&. See
Section 4.1.6, \(lqOperator Precedence\(rq, in the documentation
for precedence details\&.
.PP
The obsolete options
SORT1,
SORT2,
LTCMP, and
GTCMP
were formerly used to specify the names of sort operators associated with a merge\-joinable operator\&. This is no longer necessary, since information about associated operators is found by looking at B\-tree operator families instead\&. If one of these options is given, it is ignored except for implicitly setting
MERGES
true\&.
.PP
Use
DROP OPERATOR (\fBDROP_OPERATOR\fR(7))
to delete user\-defined operators from a database\&. Use
ALTER OPERATOR (\fBALTER_OPERATOR\fR(7))
to modify operators in a database\&.
.SH "EXAMPLES"
.PP
The following command defines a new operator, area\-equality, for the data type
box:
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE OPERATOR === (
    LEFTARG = box,
    RIGHTARG = box,
    PROCEDURE = area_equal_procedure,
    COMMUTATOR = ===,
    NEGATOR = !==,
    RESTRICT = area_restriction_procedure,
    JOIN = area_join_procedure,
    HASHES, MERGES
);
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
\fBCREATE OPERATOR\fR
is a
PostgreSQL
extension\&. There are no provisions for user\-defined operators in the SQL standard\&.
.SH "SEE ALSO"
ALTER OPERATOR (\fBALTER_OPERATOR\fR(7)), CREATE OPERATOR CLASS (\fBCREATE_OPERATOR_CLASS\fR(7)), DROP OPERATOR (\fBDROP_OPERATOR\fR(7))

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