"L B" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > I would like to know if there is any difference > between using 3 indexes on three different fields or > just an index which groups them, in terms of physical > size and performance.
Yes. In both cases, there are queries that will benefit from such indexes, and queries that won't be able to use them. > I have seen that sqlite cannot use more than one index > at a time, so I was wondering if the second option is > always the best solution. Not always. If you have a single index on (X, Y, Z), it can't be used for queries like select * from mytable where Y=?; select * from mytable where Z=?; for the same reason that the sort order in a dictionary doesn't help you find all words whose second letter is 'a'. Igor Tandetnik _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
