Cory at SkyVantage wrote:
gerald_clark wrote:
How many possible values may res_status have? What percentage for
each value? It may not be possible to use an index on this field.
The res_status field may have up to 10 different values from 0-9. and
there will be a huge amounts of '0' and thousands of records with 1-9
(most likely ~70% '0's)
Cory
Then a full table scan is faster than using an index for res_status=0.
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