CREATE OR ALTER TRIGGER

`CREATE OR ALTER TRIGGER`

Creates a trigger if it doesn’t exist, or alters a trigger

Available in

DSQL

Syntax

CREATE OR ALTER TRIGGER trigname
  { <relation_trigger_legacy>
  | <relation_trigger_sql>
  | <database_trigger>
  | <ddl_trigger> }
  {<psql_trigger> | <external-module-body>}

!! See syntax of CREATE TRIGGER for further rules !!

The CREATE OR ALTER TRIGGER statement creates a new trigger if it does not exist;otherwise it alters and recompiles it with the privileges intact and dependencies unaffected.

Example of `CREATE OR ALTER TRIGGER`

Creating a new trigger if it does not exist or altering it if it does exist

CREATE OR ALTER TRIGGER set_cust_no
ACTIVE BEFORE INSERT ON customer POSITION 0
AS
BEGIN
  IF (NEW.cust_no IS NULL) THEN
    NEW.cust_no = GEN_ID(cust_no_gen, 1);
END

CREATE OR ALTER TRIGGER

CREATE OR ALTER TRIGGER

Example of CREATE OR ALTER TRIGGER

`CREATE OR ALTER TRIGGER`

Example of `CREATE OR ALTER TRIGGER`