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You can also perform more complicated updates in Oracle.
You may wish to update records in one table based on values in another table.
As we’ve already created both the tables in above example, we will directly write a trigger for ‘AFTER UPDATE’.
CREATE or REPLACE TRIGGER emp_after_update AFTER UPDATE OF empid ON emp FOR EACH ROW DECLARE BEGIN update emp_backup set empid = :new.empid where empid = :old.empid; DBMS_OUTPUT.
CREATE or REPLACE TRIGGER emp_after_insert AFTER INSERT ON emp FOR EACH ROW DECLARE BEGIN insert into emp_backup values (:new.empid, :new.fname, :new.lname); DBMS_OUTPUT.
PUT_LINE('Record successfully inserted into emp_backup table'); END; Second Problem: We want o update a record in the ’emp_backup’ table if a corresponding record is updated in the ’emp’ table.
Since you can't list more than one table in the Oracle UPDATE statement, you can use the Oracle EXISTS clause.
On recompiling the dependent objects become invalid.The Oracle UPDATE statement is used to update existing records in a table in an Oracle database.There are 2 syntaxes for an update query in Oracle depending on whether you are performing a traditional update or updating one table with data from another table.Vishwanath Dalvi is a gifted engineer and tech enthusiast. When not hacking around or supporting the open source community, he is trying to overcome his phobia of dogs.SQL, SQL Server, Tutorials, Oracle, PL/SQL, Interview Questions & Answers, Joins, Multiple Choice Questions, Quiz, Stored Procedures, Select, Insert, Update, Delete and other latest topics on SQL, SQL Server and Oracle.