OUTER JOIN query returns the results of JOIN IN-HOUSE 11.2.0.1.0

I'm data transfer in 11.2.01.0 (Windows XP 32-bit) and I wanted to compare the sizes of table with the same Table name in two different patterns, ML and SILENT, with a FULL OUTER JOIN (to account for all the tables and NULL values in a diagram).

The scheme of ML has 176 tables: schema TUT a 133 tables. The use of a standard INNER JOIN gives 131 paintings.

I get precisely the results with a FULL OUTER JOIN I get with an INTERNAL JOIN (not the same NULL values so I know they exist).

This happens in SQL-Plus, SQL_Developer and using Oracle Wire pilot of Data_Direct.

Here is the code:

Login: SYS as SYSDBA or SYSTEM (same results for either)

SELECT M.TABLE_NAME, M.NUM_ROWS, T.TABLE_NAME, T.NUM_ROWS
OF SYS. ALL_TABLES M FULL OUTER JOIN SYS. ALL_TABLES T ON M.TABLE_NAME = T.TABLE_NAME
WHERE
M.OWNER = 'ML' AND
T.OWNER = 'TUT';

Produce the same results with LEFT OUTER joins and RIGHT OUTER joins in ASI and Oracle (+) syntax.

Any thoughts?

Hello

If you read what I posted, forget it. MScallion (below) gave the correct answerr.

If conditions such as

owner   = 'ML'

in the WHERE clause, and then they will reject the rows of the result set formed by the join condition.

The inner join returns only 131 lines where the two 'paintings' have the same table_names.
The outer joins return multiple lines (133, 176 or 178) before the place WHERE the provision is applied , but the WHERE clause eliminates all lines except the 131 found by the inner join.

Published by: Frank Kulash, July 10, 2010 14:23

Tags: Database

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