Subject | Re: [firebird-support] Re: Creating index |
---|---|
Author | Wei Yu |
Post date | 2006-02-12T01:27:52Z |
Hi, Adam
<Quaoted>
Generally no.
There are exceptions if the field values are skewed. For example, if 99% of the values are 'Y', and only 1% are 'N', then the index would
be very useful to perform where field = 'N'.
<Quaoted>
what if using where field <> 'N' or where field = 'Y', will the index be used?
Thanks, Much appreicated.
William
William, Yu
---------------------------------
Brings words and photos together (easily) with
PhotoMail - it's free and works with Yahoo! Mail.
[Non-text portions of this message have been removed]
<Quaoted>
Generally no.
There are exceptions if the field values are skewed. For example, if 99% of the values are 'Y', and only 1% are 'N', then the index would
be very useful to perform where field = 'N'.
<Quaoted>
what if using where field <> 'N' or where field = 'Y', will the index be used?
Thanks, Much appreicated.
William
William, Yu
---------------------------------
Brings words and photos together (easily) with
PhotoMail - it's free and works with Yahoo! Mail.
[Non-text portions of this message have been removed]