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Oracle trigger where clause updating

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ID, tab2.col1, tab2.col2, tab2.idt1) values(seq2.nextval, :new.col1, :new.col2, :new. = :new.col1) or (:old.col1 is null and :new.col1 is not null) or (:old.col1 is not null and :new.col1 is null)begin .....

This Oracle WHERE clause example uses the WHERE clause to define multiple conditions, but instead of using the AND condition, it uses the OR condition.

” I already wrote about functions and procedures in Learn Oracle: Procedures and Functions.

You should probably read that one before you read this post. A trigger is a special case of stored procedure that is fired during an event rather than being explicitly executed.

A constraint applies to both existing and new data.

For example, if a database column has a values that were inserted into the column before the trigger was defined or while the trigger was disabled.

I'm currently facing a problem while I'm adding a trigger to the database that I use at home.

Unlike a stored procedure, you can enable and disable a trigger, but you cannot explicitly invoke it.

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.

Triggers can be: Trigger names must be unique with respect to other triggers in the same schema.

PUT_LINE('Inserting'); WHEN UPDATING('salary') THEN DBMS_OUTPUT. PUT_LINE('Updating salary'); WHEN UPDATING('department_id') THEN DBMS_OUTPUT. PUT_LINE('Updating department ID'); WHEN DELETING THEN DBMS_OUTPUT.

This statement can be used with any interactive tool, such as SQL*Plus or Enterprise Manager.