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Message Posted: Thu, 24 Jan 2008 @ 10:32:45 GMT
I get confused by the logic of the 'NOT LIKE'. The case is that I have a table with 413644 records and there is a column in it called 'URL_TXT'.
So what I did is:
First, I ran the following query:
sel count(*) from Tbl_A where url_txt like 'http://%' OR url_txt like 'https://%'
I got the row count 240624.
And then, I ran another query:
sel count(*) from Tbl_A where url_txt NOT like 'http://%' AND url_txt NOT like 'https://%'
And I only got the row count 200!
It really confused me. Shouldn't the result be 413644 - 240624 = 173020 rows?
I am in a V2R6 system and I've found nothing from the manual of 'LIKE'.
Could anyone explain this?
Really appreciate your helps!
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