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Where do I find the triggers in DB2?
A trigger is a piece of code that is automatically executed, or fired in response to a data modification event on a table. The data modification event include insert, update, delete driven by an INSERT, DELETE, UPDATE, and MERGE statement. Db2 stores the triggers in the database catalog, where each trigger is attached to a single table.
How is a trigger defined in SQL Server?
A trigger defines a set of actions that are performed in response to an insert, update, or delete operation on a specified table. When such an SQL operation is executed, the trigger is said to have been activated. Triggers are optional and are defined using the CREATE TRIGGER statement.
What is the trigger granularity in IBM DB2?
The statement that causes a trigger to be activated includes a set of affected rows. These are the rows of the subject table that are being inserted, updated, or deleted. The trigger granularity specifies whether the actions of the trigger are performed once for the statement or once for each of the affected rows.
Where are the triggers stored in a database?
This chapter describes triggers, their types, creation and dropping of the triggers. A trigger is a set of actions, which are performed for responding to an INSERT, UPDATE or DELETE operation on a specified table in the database. Triggers are stored in the database at once.
How many times can a trigger event be specified?
1 OLD and NEW can only be specified once each. 2 OLD TABLE and NEW TABLE can only be specified once each, and only for AFTER triggers or INSTEAD OF triggers. 3 FOR EACH STATEMENT may not be specified for BEFORE triggers or INSTEAD OF triggers. 4 A trigger event must not be specified more than once for the same operation.
Can a trigger be defined for an old table?
Only one OLD TABLE and one NEW TABLE identifier may be specified for a trigger (SQLSTATE 42613). OLD TABLE or NEW TABLE identifiers cannot be defined in a BEFORE trigger (SQLSTATE 42898). A NEW transition variable can only be the target of an assignment in a BEFORE trigger.
What do you mean by Trigger in SQL?
A trigger defines a set of actions that are executed with, or triggered by, an INSERT, UPDATE, or DELETE statement. This statement can be embedded in an application program or issued through the use of dynamic SQL statements.