Sense (+) sign

Sorry for the question such that it is perhaps too easy to ask here, but I found nothing in the internet. I received a query part of which is as follows:

WHERE A. NUMBER = BH. NUMBER (+)

Whatever (+) sign in where clause? It is used only to where clauses?

Published by: Mikhail on 07.06.2011 03:08

Hello

Mikhail says:
Sorry for the question such that it is perhaps too easy to ask here, but I found nothing in the internet. I received a query part of which is as follows:

WHERE an.nomer = bh.nomer (+)

Which denotes an outer join in the old notation to join.
In a normal, inner, join on condition

WHERE   an.nomer = bh.nomer

lines to appear a table in the result set only if they meet the rows in table BH.
In an outer join, as you posted, at least one copy of each rank on the YEAR will appear in the game (subject to the other conditions), even if it does not match what both in Bosnia and Herzegovina.

Whatever (+) sign in where clause? It is used only to where clauses?

Yes, it occurs only in the WHERE clause.
Using the ANSI notation, in which the join conditions are not in the WHERE clause, you do not use this symbol. An ANSI equivalent is

FROM             an
LEFT OUTER JOIN  bh   ON  an.nomer = bh.nomer

Here is an example:

SELECT     e.empno
,     e.ename
,     e.mgr
,     m.ename AS boss
FROM     scott.emp     e
,     scott.emp     m
WHERE     e.mgr          = m.empno (+)
AND     e.deptno     = 10
;

Output:

`    EMPNO ENAME             MGR BOSS
---------- ---------- ---------- ----------
      7782 CLARK            7839 KING
      7839 KING
      7934 MILLER           7782 CLARK

As you can see, the e table with ename = 'KING' line appears in the result set, even if she has no match in the table Mr. columns that otherwise would come from table m are NULL in this case.
However, not all 14 e table ranks are as a result set. The condition 'e.deptno = 10' excluded 11 of the 14 lines. That's what I meant by "subject to other conditions.

Published by: Frank Kulash, June 7, 2011 06:15
Example added scott.emp

Tags: Database

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