|The PostgreSQL 9.0 Reference Manual - Volume 1B - SQL Command Reference
by The PostgreSQL Global Development Group
Paperback (6"x9"), 488 pages
RRP £14.95 ($19.95)
Sales of this book support the PostgreSQL project! Get a printed copy>>>
1.53 CREATE OPERATOR FAMILY
CREATE OPERATOR FAMILY -- define a new operator family
CREATE OPERATOR FAMILY name USING index_method
CREATE OPERATOR FAMILY creates a new operator family.
An operator family defines a collection of related operator classes,
and perhaps some additional operators and support functions that are
compatible with these operator classes but not essential for the
functioning of any individual index. (Operators and functions that
are essential to indexes should be grouped within the relevant operator
class, rather than being “loose” in the operator family.
Typically, single-data-type operators are bound to operator classes,
while cross-data-type operators can be loose in an operator family
containing operator classes for both data types.)
The new operator family is initially empty. It should be populated
by issuing subsequent
CREATE OPERATOR CLASS commands
to add contained operator classes, and optionally
ALTER OPERATOR FAMILY commands to add “loose”
operators and their corresponding support functions.
If a schema name is given then the operator family is created in the specified schema. Otherwise it is created in the current schema. Two operator families in the same schema can have the same name only if they are for different index methods.
The user who defines an operator family becomes its owner. Presently, the creating user must be a superuser. (This restriction is made because an erroneous operator family definition could confuse or even crash the server.)
Refer to Volume 2: Interfacing Extensions To Indexes for further information.
- The name of the operator family to be created. The name can be schema-qualified.
- The name of the index method this operator family is for.
CREATE OPERATOR FAMILY is a
PostgreSQL extension. There is no
CREATE OPERATOR FAMILY statement in the SQL
|ISBN 9781906966058||The PostgreSQL 9.0 Reference Manual - Volume 1B - SQL Command Reference||See the print edition|