CREATE RULE

Synopsis

Use the CREATE RULE statement to create a rule.

Syntax

create_rule ::= CREATE [ OR REPLACE ] RULE rule_name AS ON rule_event 
                TO table_name [ WHERE boolean_expression ] DO 
                [ ALSO | INSTEAD ] { NOTHING
                                     | command
                                     | ( command [ ; ... ] ) }

rule_event ::= SELECT | INSERT | UPDATE | DELETE

command ::= SELECT | INSERT | UPDATE | DELETE | NOTIFY

create_rule

CREATEORREPLACERULErule_nameASONrule_eventTOtable_nameWHEREboolean_expressionDOALSOINSTEADNOTHINGcommand(;command)

rule_event

SELECTINSERTUPDATEDELETE

command

SELECTINSERTUPDATEDELETENOTIFY

Semantics

See the semantics of each option in the [PostgreSQL docs][postgresql-docs-create-rule].

Examples

Basic example.

yugabyte=# CREATE TABLE t1(a int4, b int4);
yugabyte=# CREATE TABLE t2(a int4, b int4);
yugabyte=# CREATE RULE t1_to_t2 AS ON INSERT TO t1 DO INSTEAD
             INSERT INTO t2 VALUES (new.a, new.b);
yugabyte=# INSERT INTO t1 VALUES (3, 4);
yugabyte=# SELECT * FROM t1;

 a | b
---+---
(0 rows)

yugabyte=# SELECT * FROM t2;

 a | b
---+---
 3 | 4
(1 row)

See also