Key preserved table removal: need help.

Note When I followed the example of oradoc (in bold large print below):

DELETE the instructions

You can delete a view in join provided there is one and the same table in the join key. The key-preserved table can be repeated in the FROM article.

The following DELETE statement works on the emp_dept view:

DELETE FROM emp_dept WHERE ename = 'SMITH';

This DELETE declaration on the emp_dept view is legal, because it can be translated to a DELETE operation on the basis of emp table and because only the emp table is the table of key-preserved only in the join.

In the following view, a DELETE operation is permitted, because even though there are two tables stored in the key, they are from the same table. In other words, the key-preserved table is repeated. In this case, the delete statement works on the first table of the FROM list ( e1 , in this example):

CREATE VIEW emp_emp

SELECT e1.ename, e2.empno, e2.deptno

E1, e2 emp EMP

WHERE e1.empno = e2.empno;

I tried the above and it worked very well. Here's my version of how I tried

CREATE VIEW emp_emp

SELECT e1.last_name, e2.employee_id, e2.department_id

Of e1, e2 used employees2

WHERE e1.employee_id = e2.employee_id; / * (table employees in the HR diagram) * /.

delete from emp_emp where employee_id between 100 and 190;

then I tried my own and not much luck. Notice in the example I use the employees of HR diagram below table

In any case here it is:

CREATE VIEW Emp_test AS

SELECT the name of e1.last_name, e1.employee_id, e2.department_id

OF Employees2 e1, e2 Employees2

WHERE e1.employee_id = e2.employee_id;

delete from emp_test where employee_id = 100;

Note there is a preserved here, my employees2 table underlying table key.



Error: ORA-01752: cannot delete the view without exactly a key preserved table

01752 00000 - "impossible to remove from the view without exactly one key-preserved table.

* Cause: The deleted table had

-No table preserved key,

-several tables preserved key, or

-the key preserved table was a display not merged.

* Action: Redefine the view or remove it from the underlying base table.

In this case, it is simply repeated and as the doc said:

DELETE the instructions

You can delete a view in join provided there is one and the same table in the join key. The key-preserved table can be repeated in the FROM article.

http://docs.Oracle.com/database/121/admin/views.htm#ADMIN11782

What Miss me in my script...? I haven't tried a few variations, no luck, I can't understand what is wrong.

In the doc if you ctrl + f, the word 'repeat' it will find repeated preserved much easier key topics (this is the only time the word repetition is used)

Textbooks are wrong, besides - you can delete a view in join even with several DIFFERENT tables preserved key in the view definition.

Build a script - followed by the exit.

create table emp2 in select * from emp;

ALTER table emp2 add constraint e2_pk key (empno) primary;

Select count (*) from emp2;

create or replace view emp_emp as

Select e1.ename, e2.empno, e2.deptno

-of emp e1, e2 emp2

of e1, e2 emp emp2

where e1.empno = e2.empno

;

delete from emp_emp where empno = 7900;

delete from emp_emp where empno between 7400 and 7600;

Select count (*) from emp;

Select count (*) from emp2;

-----

Table created.

Modified table.

COUNT (*)

----------

14

1 selected line.

Created view.

1 line removal.

3 deleted rows.

COUNT (*)

----------

14

1 selected line.

COUNT (*)

----------

10

1 selected line.

The script has two options for the FROM clause and (as the manual says in fact) the FIRST table in the from clause is the one whose lines are deleted.

I thought that I had written something on this several years ago, but if I can't find the article.

Concerning

Jonathan Lewis

Tags: Database

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