CREATE_OPERATOR man page on Kali

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CREATE OPERATOR(7)	 PostgreSQL 10.1 Documentation	    CREATE OPERATOR(7)

NAME
       CREATE_OPERATOR - define a new operator

SYNOPSIS
       CREATE OPERATOR name (
	   PROCEDURE = function_name
	   [, LEFTARG = left_type ] [, RIGHTARG = right_type ]
	   [, COMMUTATOR = com_op ] [, NEGATOR = neg_op ]
	   [, RESTRICT = res_proc ] [, JOIN = join_proc ]
	   [, HASHES ] [, MERGES ]
       )

DESCRIPTION
       CREATE OPERATOR defines a new operator, name. 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.

       The operator name is a sequence of up to NAMEDATALEN-1 (63 by default)
       characters from the following list:

	   + - * / < > = ~ ! @ # % ^ & | ` ?

       There are a few restrictions on your choice of name:

       ·   -- and /* cannot appear anywhere in an operator name, since they
	   will be taken as the start of a comment.

       ·   A multicharacter operator name cannot end in + or -, unless the
	   name also contains at least one of these characters:

	       ~ ! @ # % ^ & | ` ?

	   For example, @- is an allowed operator name, but *- is not. This
	   restriction allows PostgreSQL to parse SQL-compliant commands
	   without requiring spaces between tokens.

       ·   The use of => as an operator name is deprecated. It may be
	   disallowed altogether in a future release.

       The operator != is mapped to <> on input, so these two names are always
       equivalent.

       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.

       The function_name procedure must have been previously defined using
       CREATE FUNCTION and must be defined to accept the correct number of
       arguments (either one or two) of the indicated types.

       The other clauses specify optional operator optimization clauses. Their
       meaning is detailed in Section 37.13.

       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.

PARAMETERS
       name
	   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.

       function_name
	   The function used to implement this operator.

       left_type
	   The data type of the operator's left operand, if any. This option
	   would be omitted for a left-unary operator.

       right_type
	   The data type of the operator's right operand, if any. This option
	   would be omitted for a right-unary operator.

       com_op
	   The commutator of this operator.

       neg_op
	   The negator of this operator.

       res_proc
	   The restriction selectivity estimator function for this operator.

       join_proc
	   The join selectivity estimator function for this operator.

       HASHES
	   Indicates this operator can support a hash join.

       MERGES
	   Indicates this operator can support a merge join.

       To give a schema-qualified operator name in com_op or the other
       optional arguments, use the OPERATOR() syntax, for example:

	   COMMUTATOR = OPERATOR(myschema.===) ,

NOTES
       Refer to Section 37.12 for further information.

       It is not possible to specify an operator's lexical precedence in
       CREATE OPERATOR, because the parser's precedence behavior is
       hard-wired. See Section 4.1.6 for precedence details.

       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.

       Use DROP OPERATOR (DROP_OPERATOR(7)) to delete user-defined operators
       from a database. Use ALTER OPERATOR (ALTER_OPERATOR(7)) to modify
       operators in a database.

EXAMPLES
       The following command defines a new operator, area-equality, for the
       data type box:

	   CREATE OPERATOR === (
	       LEFTARG = box,
	       RIGHTARG = box,
	       PROCEDURE = area_equal_procedure,
	       COMMUTATOR = ===,
	       NEGATOR = !==,
	       RESTRICT = area_restriction_procedure,
	       JOIN = area_join_procedure,
	       HASHES, MERGES
	   );

COMPATIBILITY
       CREATE OPERATOR is a PostgreSQL extension. There are no provisions for
       user-defined operators in the SQL standard.

SEE ALSO
       ALTER OPERATOR (ALTER_OPERATOR(7)), CREATE OPERATOR CLASS
       (CREATE_OPERATOR_CLASS(7)), DROP OPERATOR (DROP_OPERATOR(7))

PostgreSQL 10.1			     2017		    CREATE OPERATOR(7)
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