Alexey Pechnikov wrote:
> 
> I think, you can use index directly as
> create index id_idx on mytable(id);
> 
> select count(id) from mytable where id>0;
> 
> explain query plan select count(id) from mytable where id>0;
> 0|0|TABLE mytable WITH INDEX id_idx
> 
> It's better than use count(*) with "where" condition.

I can't see how this improves the situation any. You are making SQLite 
do a full scan of the index (assuming all records have an id > 0) 
instead of a full scan of the table. It still has to count each record.

Dennis Cote
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