15.3. CREATE TRIGGER

The CREATE TRIGGER command defines and names a trigger that will be stored in the database.

CREATE [ OR REPLACE ] TRIGGER name
{ BEFORE | AFTER } { INSERT | UPDATE | DELETE } [ OR { INSERT | UPDATE | DELETE } ]... ON
table
[ FOR EACH ROW ]
[DECLARE
    declarations ]
BEGIN
    statements
END;

name is the name of the trigger. If [ OR REPLACE ] is specified and a trigger with the same name already exists in the schema, the new trigger replaces the existing one. If [ OR REPLACE ] is not specified, the new trigger will not be allowed to replace an existing one with the same name in the same schema. If BEFORE is specified, the trigger is defined as a before trigger. If AFTER is specified, the trigger is defined as an after trigger. One of INSERT, UPDATE, or DELETE must be specified defining the triggering event as an insert, update, or deletion, respectively. One or both of the remaining triggering event keywords may also be specified separated by the keyword, OR, in which case these are also defined as triggering events. table is the name of the table on which a triggering event will cause the trigger to fire. If [ FOR EACH ROW ] is specified, the trigger is defined as a row-level trigger. If [ FOR EACH ROW ] is omitted, the trigger is defined as a statement-level trigger. declarations are variable, cursor, or type declarations. statements are SPL program statements. The BEGIN - END block may contain an EXCEPTION section.