Trigger updating same row

In DB2 before triggers are read only — you can't modify data in before triggers.After triggers are designed for post processing after requested change was performed.Before trigger is for checking data and deciding if operation should be permitted.If exception is thrown from before trigger then operation is aborted and no data are changed.Suppose you have a trigger that is made to be called on an UPDATE to a certain table.Row level triggers would execute once for each row that is affected by the UPDATE.After triggers can write data into tables and unlike some SQLite only supports row-level triggers, not statement-level triggers.Updateable views, which are not supported in SQLite, can be emulated with INSTEAD OF triggers.

If your trigger is using the BEFORE option, the code within the trigger will be executed before the INSERT into the table occurs.An example of implementation of triggers in non-relational database can be Sedna, that provides support for triggers based on XQuery.Triggers in Sedna were designed to be analogous to SQL:2003 triggers, but natively base on XML query and update languages (XPath, XQuery and XML update language).A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database.The trigger is mostly used for maintaining the integrity of the information on the database.

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