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Triggers could be defined on the table, view, schema, or database with which the event is associated. Declaration-statements. Executable-statements. Exception-handling-statements. CREATE [OR REPLACE] TRIGGER trigger_name: Creates or replaces an existing trigger with the trigger_name.
23 sty 2024 · In PL/SQL, triggers are special stored procedures that automatically execute in response to specific events on a table or view. Among these, row-level triggers are particularly useful for enforcing business rules, maintaining data integrity, and automating tasks.
From within SQL*PLUS, a procedure can be executed by using EXECUTE command, followed by the procedure name. EXECUTE procedure_name(parameter1_value, parameter2_value,...); From within another procedure, function, package, or trigger, the procedure can be called without the EXECUTE command.
Write PL/SQL statements to create the trigger, and use some SQL update and insert statements to test it. The trigger we need is a row-level trigger. The triggering events are UPDATE of salary and INSERT. The proper PL/SQL statements are as follows: RAISE_APPLICATION_ERROR(-20512, ‘The salary cannot exceed 5000.’); Trigger created.
13 wrz 2024 · Row-level triggers execute once for each row affected by an INSERT, UPDATE, or DELETE operation. This makes them ideal for performing actions specific to each row being processed. Syntax of Row-Level Triggers. The basic syntax for creating a row-level trigger in PL/SQL is: -- Trigger logic here. Parameters:
20 lis 2024 · In the PL SQL Transactions tutorial of the PL/SQL series, we have learned about COMMIT, ROLLBACK, and SAVEPOINTS statements. In this article, we will explore triggers in PL SQL and their advantages, types, and usage.
Chapter 3: PL/ SQL Block: STRUCTURE, Syntax, ANONYMOUS Example What is PL/SQL block? In PL/SQL, the code is not executed in single line format, but it is always executed by grouping the code into a single element called Blocks. In this tutorial, you are going to learn about these blocks.
