Updating multiple fields in oracle

08-Aug-2020 09:29 by 4 Comments

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For information changing conditions and their impact on views, see SELECT * FROM Division1_staff; ENAME EMPNO JOB DNAME ------------------------------------------------------ CLARK 7782 MANAGER ACCOUNTING KING 7839 PRESIDENT ACCOUNTING MILLER 7934 CLERK ACCOUNTING ALLEN 7499 SALESMAN SALES WARD 7521 SALESMAN SALES JAMES 7900 CLERK SALES TURNER 7844 SALESMAN SALES MARTIN 7654 SALESMAN SALES BLAKE 7698 MANAGER SALES This error message is returned when a view exists but is unusable due to errors in its query (whether it had errors when originally created or it was created successfully but became unusable later because underlying objects were altered or dropped). Additionally, if a view is a join on other nested views, then the other nested views must be mergeable into the top level view.For a discussion of mergeable and unmergeable views, and more generally, how the optimizer optimizes statements that reference views, see the Examples illustrating the rules for inherently updatable join views, and a discussion of key-preserved tables, are presented in following sections.

updating multiple fields in oracle-83

All operations performed on a view actually affect the base table of the view.

Note: It is not necessary that the key or keys of a table be selected for it to be key preserved.

It is sufficient that if the key or keys were selected, then they would also be keys of the result of the join.

When you try to create such a view, the database returns a message indicating the view was created with errors.

If conditions later change so that the query of an invalid view can be executed, the view can be recompiled and be made valid (usable).

EMPNO ENAME DEPTNO DNAME LOC ---------- ---------- ------- -------------- ----------- 7782 CLARK 10 ACCOUNTING NEW YORK 7839 KING 10 ACCOUNTING NEW YORK 7934 MILLER 10 ACCOUNTING NEW YORK 7369 SMITH 20 RESEARCH DALLAS 7876 ADAMS 20 RESEARCH DALLAS 7902 FORD 20 RESEARCH DALLAS 7788 SCOTT 20 RESEARCH DALLAS 7566 JONES 20 RESEARCH DALLAS 8 rows selected.

operation is permitted, because although there are two key-preserved tables, they are the same table. In this case, the delete statement operates on the first table in the EMPNO ENAME DEPTNO DNAME LOC ------- ---------- ------- -------------- ------------- 7369 SMITH 40 OPERATIONS BOSTON 7499 ALLEN 30 SALES CHICAGO 7566 JONES 20 RESEARCH DALLAS 7654 MARTIN 30 SALES CHICAGO 7698 BLAKE 30 SALES CHICAGO 7782 CLARK 10 ACCOUNTING NEW YORK 7788 SCOTT 20 RESEARCH DALLAS 7839 KING 10 ACCOUNTING NEW YORK 7844 TURNER 30 SALES CHICAGO 7876 ADAMS 20 RESEARCH DALLAS 7900 JAMES 30 SALES CHICAGO 7902 FORD 20 RESEARCH DALLAS 7934 MILLER 10 ACCOUNTING NEW YORK 7521 WARD 30 SALES CHICAGO 14 rows selected.

You can use views in almost the same way as tables.

You can query, update, insert into, and delete from views, just as you can standard tables.

A table is key-preserved if every key of the table can also be a key of the result of the join.

So, a key-preserved table has its keys preserved through a join.

Table 8-1 indicates how this template is built step by step.

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