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Because the trigger uses the clause, it might be executed multiple times, such as when updating or deleting multiple rows.You might omit this clause if you just want to record the fact that the operation occurred, but not examine the data for each row.After the trigger is created, following SQL statement fires the trigger once for each row that is updated, in each case printing the new salary, the old salary, and the difference between them: Trigger names must be unique with respect to other triggers in the same schema.
In all cases, the SQL statements running within triggers follow the common rules used for standalone SQL statements.
In particular, if an uncommitted transaction has modified values that a trigger being fired either must read (query) or write (update), then the SQL statements in the body of the trigger being fired use the following guidelines: privilege.
If this privilege is later revoked, you can drop the trigger but not alter it.
The object privileges to the schema objects referenced in the trigger body must be granted to the trigger owner explicitly (not through a role).
The statements in the trigger body operate under the privilege domain of the trigger owner, not the privilege domain of the user issuing the triggering statement (this is similar to the privilege model for stored subprograms).