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I am using Sql Server 2000 and want to know why we can not create index on bit fields?
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Just a limitation of the product. SQL Server 2005+ does allow this.
Because of the Tipping Point a single column
bitindex is unlikely to be very useful unless the values are heavily skewed (a scenario for which filtered indexes in 2008 can help)Still - could be useful as part of a composite covering index though.
I would guess this is by design.A bit field can only have 1 of 2 values, so it would not be selective enough for an index to be useful.