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Simple Question about the IN condition

Posted on 2013-01-18
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Last Modified: 2013-01-18
So i did a SQL two different ways. One is with an OR and the other is with the IN condition.

I thought the IN was an alternate way oF using OR (for the purpose of cutting down on using ORs, that iS).

Why then when I do this, do I get different results?

SELECT 
  COUNT(*)
FROM table a
WHERE 
type = '102' OR type = '103'
      AND SEQ = '1' --current row of data, if desired
      AND STATUS = 'A' --active  ('I' = inactive), if desired

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THE ABOVE RETURNS A FEW HUNDRED MORE ROWS THAN THE BELOW

and this:

SELECT 
COUNT(*)
FROM TABLE A
WHERE TYPE IN ('102','103')
      AND SEQ = '1' --current row of data, if desired
      AND STATUS = 'A' --active  ('I' = inactive), if desired
      

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Question by:Mark_Co
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3 Comments
 
LVL 77

Accepted Solution

by:
slightwv (䄆 Netminder) earned 300 total points
ID: 38794156
It's a logic issue.

a or b and c
is different than:
(a or b) and c

Try this to see if the results are the same:

WHERE
(type = '102' OR type = '103')
      AND SEQ = '1' --current
0
 
LVL 74

Assisted Solution

by:sdstuber
sdstuber earned 200 total points
ID: 38794161
order of operations

AND before OR
0
 

Author Closing Comment

by:Mark_Co
ID: 38794182
Thanks
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