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Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community A mutating table is a table that is being modified by an UPDATE, DELETE, or INSERT statement, or a table that might be updated by the effects of a DELETE CASCADE constraint.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.
A trigger is fired based on a triggering statement, which specifies: statement might include a list of columns. Deptno) AS Amp_list_ Emplist FROM Dept_tab d; The statement level triggers are useful for performing validation checks for the entire statement.create or replace trigger TR_TB_TR_TEST 2 before insert on TB_TR_TEST 3 for each row 4 begin 5 SELECT max(col1) 1 INTO : NEW.col1 6 FROM TB_TR_TEST; 7 UPDATE TB_TR_TEST SET col2 = 5000; 8 end; 9 / Trigger created insert into TB_TR_TEST(col1, col2) 2 select 1, 2 3 from dual; insert into TB_TR_TEST(col1, col2) select 1, 2 from dual ORA-04091: table HR.TB_TR_TEST is mutating, trigger/function may not see it ORA-06512: at "HR.They fire for each nested table element being modified. Two correlation names exist for every column of the table being modified: one for the old column value, and one for the new column value.The row correlation variables inside the trigger correspond to the nested table element. Depending on the type of triggering statement, certain correlation names might not have any meaning.