My db has a column called "status". This can take one of 7 or so integer values from 0 to 7 or so. There are times when I need a quick answer to this question: are there any rows in the db for which status has value 0. I don't need to know how many, just whether there are any or not. What's the least expensive form of making this query?
So far I've tried: select count(status) from mytable where status=0; select count(status) from mytable where status=0 limit 1; select status from mytable where status=0 limit 1; When doing this a number of times I see some seconds of CPU being taken; I haven't yet pinned it down to being an SQLite problem - I'm about to do some timings to see where the time is going. I've added an index: create index stat on mytable (status asc); and using the third form above together with an index seems to improve matters a bit. If all the forms above are roughly equivalent that would be helpful to know. There are 3000 or so rows in the table. -- Cheers -- Tim
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