Updating data in a view oracle

In SQL, a view is a virtual table based on the result-set of an SQL statement.

Does it mean delete the LCR department from the dept_code table?

Does it mean delete all employees that are in department LCR?

If the view is complex this can take sometime, this is where a materialized views comes in, unlike a view it contains space and storage just like a regular table.

You can even partition them and create indexes on them.

Creating materialized views is simple but optimizing it can be tricky, keeping the data up to date and also getting the CBO (cost based optimizer) to use the view.

: PARENT.dname); END; / set serveroutput on UPDATE TABLE ( SELECT FROM dept_or p WHERE deptno = 10) SET ename = LOWER(ename); ON ov_empdept FOR EACH ROW BEGIN INSERT INTO emp (empno, ename, job, mgr, hiredate, sal, comm, deptno) VALUES (: NEW.empno, : NEW.ename, : NEW.job, : NEW.mgr, : NEW.hiredate, : NEW.sal, : NEW.comm, : deptno); INSERT INTO dept (deptno, dname, location) VALUES (: deptno, : dname, : location); END ioft_ov_empdept; / INSERT INTO ov_empdept (empno, ename, dept) VALUES (4, 'D..action_button.action_button:active.action_button:hover.action_button:focus,.action_button:hover.action_button:focus .count,.action_button:hover .count.action_button:focus .count:before,.action_button:hover .count: Error Banner.fade_out.modal_overlay.modal_overlay.hidden.modal_overlay .modal_wrapper.modal_overlay [email protected](max-width:630px)@media(max-width:630px).modal_overlay .modal_fixed_close.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:hover:before. But when I try the update, I get the following error: column of the child table.

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