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Message Posted: Mon, 16 Jul 2012 @ 12:55:39 GMT
Here is a scenario.
Table name: EMP
emp_id dept grade phone cell 3256 sale 6A 123456789 n/a 1247 mnfg 7B 321654987 999999999 1526 ? ? ? ? 5854 ? 5C 147852369 ?
I need to select the records which have some values in any of the fields besides emp_id.
To put the requirement in another way:
Filter out the records, which have all the fields (except emp_id) as NULLs.
In the above table, query should result 3 rows (emp_id 1526 should be filtered).
Here is the SQL I can think of:
Select * from emp Where dept is not null And grade is not null And pone is not null And cell is not null
Problem with this approach is, in the actual requirement, the number of fields are 35.
Checking for these many NULLs, will this cause any performance issue?
Pls. suggest if you have a better query.
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