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Message Posted: Fri, 06 Aug 2004 @ 09:39:27 GMT


     
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Subj:   Problem with Union
 
From:   Anomy Anom

<-- Anonymously Posted: Friday, August 06, 2004 10:07 -->

Hi All,

Had a strange experiance today. We had a requirement and for that we were UNION -ing 16 tables. Each table had around 5000 records.

When we issued first select query we got 5000 records

UNION with second table -- 6000

UNION with third table - 7000

UNION with fourth table - 8000

.
.
.
.
UNION with seventh table 10000

UNION with eight table - 9000 (1000 rows were reduced)

And the row count kept on decreasing until atlast we got some 5000 records. We were using only UNION and no filters at any stage.. I had the impression that while using UNION if we final count will be the maximum count , i mean if we get 10000 records at any stage the final count will not be less than that ..

Can anyone help me on this?


Thanks in advance!!



     
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