> i didn't said this condition should be *replaced* , i said that inequality
> should be *added*. then index could limit resultset, but bitwise operator will
> still be used, only on hopefully smaller set of data
Oh, sorry, I didn't understand you correctly then. But I believe that
this condition
Pavel Ivanov wrote:
>> change your query a bit when you use bitwise operations, in your case when
>> you
>> have 'AND col_c&32' you may add 'AND col_c>=32'. now index will be used
>
> col_c = 64 does pass second condition and doesn't pass first one. ;-)
> Bitwise operators cannot be changed so
Hello
PI > change your query a bit when you use bitwise operations, in your case
when you
PI > have 'AND col_c&32' you may add 'AND col_c>=32'. now index will be used
PI col_c = 64 does pass second condition and doesn't pass first one. ;-)
PI Bitwise operators cannot be changed so easily to in
> change your query a bit when you use bitwise operations, in your case when
> you
> have 'AND col_c&32' you may add 'AND col_c>=32'. now index will be used
col_c = 64 does pass second condition and doesn't pass first one. ;-)
Bitwise operators cannot be changed so easily to inequalities.
Pave
Daniel Wickes wrote:
> I'm trying to optimise some of my queries, and I would like to know if
> bitwise operators in terms will still use an index, or if I should be
> thinking about moving the more important values to separate columns that
> could be checked for equality.
>
> At the moment, I h
> In answer to your question, yes the index is used. You can see instructions
> prefixed by Idx that aren't there when the index doesn't exist.
I just want to warn you: the index is used but not for finding
appropriate value of col_c (as your question seem to imply). It is
used only to find appro
Roger Binns wrote:
> SQLite provides you the tools to find out for yourself. In the shell do
> '.explain' and then give it your query prefixed with 'EXPLAIN'. You'll get
> the virtual db engine code for the query printed out.
> ...
> In answer to your question, yes the index is used. You can se
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Daniel Wickes wrote:
> I'm trying to optimise some of my queries, and I would like to know if
> bitwise operators in terms will still use an index,
SQLite provides you the tools to find out for yourself. In the shell do
'.explain' and then give it yo
I'm trying to optimise some of my queries, and I would like to know if
bitwise operators in terms will still use an index, or if I should be
thinking about moving the more important values to separate columns that
could be checked for equality.
At the moment, I have an index created much like:
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