Re: index on null column

Hi AK,

It depends ...

If you frequently perform searches for not null values on column A and the cardinality of values is such that the optimizer is turned on by the index, then yes, potentially an index could be useful.

Also, with so many nulls, such an index would be relatively small.

Cheers

Richard

• Original Message ----- Date: Friday, March 28, 2003 10:18 am

> I have a table with column A. there are 1000000 records in table
> out of which 500o records has not null in column A rest are null.
> if i created an index on A, will it benefit .
>
> thanks,
> ak
 

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