Trigger updating column
In particular, there cannot be multiple triggers for a given table that have the same trigger event and action time.
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Like a stored procedure, a trigger is a named PL/SQL unit that is stored in the database and can be invoked repeatedly.
Unlike a stored procedure, you can enable and disable a trigger, but you cannot explicitly invoke it.
SQL statements running in triggers follow the same rules that standalone SQL statements do.
Scenario: The department's budget can't be changed after 5 pm.If an exception is raised in a TRANSACTION COMMIT trigger, the changes made by the trigger so far are rolled back and the client application is notified, but the transaction remains active as if COMMIT had never been requested; the client application can continue to make changes and re-request COMMIT.1) Row level trigger - An event is triggered for each row upated, inserted or deleted.2) Statement level trigger - An event is triggered for each sql statement executed.It’s a huge task, but your table is properly indexed so you’re not too worried.PDF (US Ltr) - 27.2Mb PDF (A4) - 27.2Mb PDF (RPM) - 26.2Mb HTML Download (TGZ) - 6.6Mb HTML Download (Zip) - 6.6Mb HTML Download (RPM) - 5.6Mb Man Pages (TGZ) - 170.6Kb Man Pages (Zip) - 279.0Kb Info (Gzip) - 2.5Mb Info (Zip) - 2.5Mb My SQL Backup and Recovery My SQL NDB Cluster 7.2 My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows If you drop a table, any triggers for the table are also dropped.Trigger names exist in the schema namespace, meaning that all triggers must have unique names within a schema.
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While a trigger is , which determines whether the trigger fires before or after the triggering statement runs and whether it fires for each row that the triggering statement affects. If the trigger is created on a schema or the database, then the triggering event is composed of either DDL or database operation statements, and the trigger is called a )".