Trigger updating column oracle
Once the trigger is created, entering the following SQL statement: A trigger is either a stored PL/SQL block or a PL/SQL, C, or Java procedure associated with a table, view, schema, or the database itself.Oracle automatically executes a trigger when a specified event takes place, which may be in the form of a system event or a DML statement being issued against the table.the column value after it has been inserted to the table.
And it’s pretty unanimous – from luminaries like Tom “Triggers are evil” Kyte to people like this dude (“Triggers are powerful – and much despised”). To answer your question, let me start by quoting myself again: Simple triggers to populate primary key columns from sequences are pretty uncontroversial; however, there is no upper limit to their potential complexity.
Triggers can be: Trigger names must be unique with respect to other triggers in the same schema.
Trigger names do not need to be unique with respect to other schema objects, such as tables, views, and procedures.
Well, I dare you to walk into a room full of Oracle experts wearing an I ♥ DATABASE TRIGGERS t-shirt. Database triggers are the Oracle feature that developers love to hate, perhaps above every other.
But, you may be wondering, why are triggers so hated? They can be hundreds of lines long and contain convoluted conditions.