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question [message #69493] Mon, 21 January 2002 12:11 Go to next message
Messages: 19
Registered: January 2002
Junior Member
why bitmap index can't be unique??????????????????
please explain.
Re: question [message #69505 is a reply to message #69493] Tue, 22 January 2002 10:15 Go to previous message
Messages: 417
Registered: September 1998
Senior Member
The Bitmap index is used to index columns which have only few different values. So it doesn't make any sense to use a bitamp index on a column where each value is unique.

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