# phpman > man > CREATE_OPERATOR_CLASS(7) CREATE OPERATOR [CLASS(7)](https://www.chedong.com/phpMan.php/man/CLASS/7/markdown) PostgreSQL 14.23 Documentation CREATE OPERATOR [CLASS(7)](https://www.chedong.com/phpMan.php/man/CLASS/7/markdown) ## NAME CREATE_OPERATOR_CLASS - define a new operator class ## SYNOPSIS CREATE OPERATOR CLASS _name_ [ DEFAULT ] FOR TYPE _data_type_ USING _index_method_ [ FAMILY _family_name_ ] AS { OPERATOR _strategy_number_ _operator_name_ [ ( _op_type_, _op_type_ ) ] [ FOR SEARCH | FOR ORDER BY _sort_family_name_ ] | FUNCTION _support_number_ [ ( _op_type_ [ , _op_type_ ] ) ] _function_name_ ( _argument_type_ [, ...] ) | STORAGE _storage_type_ } [, ... ] ## DESCRIPTION **CREATE** **OPERATOR** **CLASS** creates a new operator class. An operator class defines how a particular data type can be used with an index. The operator class specifies that certain operators will fill particular roles or “strategies” for this data type and this index method. The operator class also specifies the support functions to be used by the index method when the operator class is selected for an index column. All the operators and functions used by an operator class must be defined before the operator class can be created. If a schema name is given then the operator class is created in the specified schema. Otherwise it is created in the current schema. Two operator classes in the same schema can have the same name only if they are for different index methods. The user who defines an operator class becomes its owner. Presently, the creating user must be a superuser. (This restriction is made because an erroneous operator class definition could confuse or even crash the server.) **CREATE** **OPERATOR** **CLASS** does not presently check whether the operator class definition includes all the operators and functions required by the index method, nor whether the operators and functions form a self-consistent set. It is the user's responsibility to define a valid operator class. Related operator classes can be grouped into operator families. To add a new operator class to an existing family, specify the FAMILY option in **CREATE** **OPERATOR** **CLASS**. Without this option, the new class is placed into a family named the same as the new class (creating that family if it doesn't already exist). Refer to Section 38.16 for further information. ## PARAMETERS _name_ The name of the operator class to be created. The name can be schema-qualified. DEFAULT If present, the operator class will become the default operator class for its data type. At most one operator class can be the default for a specific data type and index method. _data_type_ The column data type that this operator class is for. _index_method_ The name of the index method this operator class is for. _family_name_ The name of the existing operator family to add this operator class to. If not specified, a family named the same as the operator class is used (creating it, if it doesn't already exist). _strategy_number_ The index method's strategy number for an operator associated with the operator class. _operator_name_ The name (optionally schema-qualified) of an operator associated with the operator class. _op_type_ In an OPERATOR clause, the operand data type(s) of the operator, or NONE to signify a prefix operator. The operand data types can be omitted in the normal case where they are the same as the operator class's data type. In a FUNCTION clause, the operand data type(s) the function is intended to support, if different from the input data type(s) of the function (for B-tree comparison functions and hash functions) or the class's data type (for B-tree sort support functions, B-tree equal image functions, and all functions in GiST, SP-GiST, GIN and BRIN operator classes). These defaults are correct, and so _op_type_ need not be specified in FUNCTION clauses, except for the case of a B-tree sort support function that is meant to support cross-data-type comparisons. _sort_family_name_ The name (optionally schema-qualified) of an existing btree operator family that describes the sort ordering associated with an ordering operator. If neither FOR SEARCH nor FOR ORDER BY is specified, FOR SEARCH is the default. _support_number_ The index method's support function number for a function associated with the operator class. _function_name_ The name (optionally schema-qualified) of a function that is an index method support function for the operator class. _argument_type_ The parameter data type(s) of the function. _storage_type_ The data type actually stored in the index. Normally this is the same as the column data type, but some index methods (currently GiST, GIN, SP-GiST and BRIN) allow it to be different. The STORAGE clause must be omitted unless the index method allows a different type to be used. If the column _data_type_ is specified as anyarray, the _storage_type_ can be declared as anyelement to indicate that the index entries are members of the element type belonging to the actual array type that each particular index is created for. The OPERATOR, FUNCTION, and STORAGE clauses can appear in any order. ## NOTES Because the index machinery does not check access permissions on functions before using them, including a function or operator in an operator class is tantamount to granting public execute permission on it. This is usually not an issue for the sorts of functions that are useful in an operator class. The operators should not be defined by SQL functions. An SQL function is likely to be inlined into the calling query, which will prevent the optimizer from recognizing that the query matches an index. Before PostgreSQL 8.4, the OPERATOR clause could include a RECHECK option. This is no longer supported because whether an index operator is “lossy” is now determined on-the-fly at run time. This allows efficient handling of cases where an operator might or might not be lossy. ## EXAMPLES The following example command defines a GiST index operator class for the data type _int4 (array of int4). See the intarray module for the complete example. CREATE OPERATOR CLASS gist__int_ops DEFAULT FOR TYPE _int4 USING gist AS OPERATOR 3 &&, OPERATOR 6 = (anyarray, anyarray), OPERATOR 7 @>, OPERATOR 8 <@, OPERATOR 20 @@ (_int4, query_int), FUNCTION 1 g_int_consistent (internal, _int4, smallint, oid, internal), FUNCTION 2 g_int_union (internal, internal), FUNCTION 3 g_int_compress (internal), FUNCTION 4 g_int_decompress (internal), FUNCTION 5 g_int_penalty (internal, internal, internal), FUNCTION 6 g_int_picksplit (internal, internal), FUNCTION 7 g_int_same (_int4, _int4, internal); ## COMPATIBILITY **CREATE** **OPERATOR** **CLASS** is a PostgreSQL extension. There is no **CREATE** **OPERATOR** **CLASS** statement in the SQL standard. ## SEE ALSO ALTER OPERATOR CLASS (**ALTER**___**OPERATOR**___**[CLASS**(7)](https://www.chedong.com/phpMan.php/man/CLASS/7/markdown)), DROP OPERATOR CLASS (**DROP**___**OPERATOR**___**[CLASS**(7)](https://www.chedong.com/phpMan.php/man/CLASS/7/markdown)), CREATE OPERATOR FAMILY (**CREATE**___**OPERATOR**___**[FAMILY**(7)](https://www.chedong.com/phpMan.php/man/FAMILY/7/markdown)), ALTER OPERATOR FAMILY (**ALTER**___**OPERATOR**___**[FAMILY**(7)](https://www.chedong.com/phpMan.php/man/FAMILY/7/markdown)) PostgreSQL 14.23 2026 CREATE OPERATOR [CLASS(7)](https://www.chedong.com/phpMan.php/man/CLASS/7/markdown)