Andrew Gatt wrote: > I'm not sure if i'm missing something, but is there an efficient way of > retrieving multiple rows based on different conditions in order. For > example i have a table with rows of ids, i want to select multiple rows > at a time. At present i am doing a "SELECT name FROM table WHERE id = x" > for each row i want and then stitching it all together. But i'm finding > this is quite slow even on a moderately small database (2000 entries). > > I'm guessing my SQL is the worst way of doing things so i've been trying > to find a better method. I stumbled across "SELECT name FROM table WHERE > id IN (x,y,z) however this doesn't allow me to specify the order the > rows are returned, which i must have. > > The only other option i can find is using UNION ALL in between multiple > SELECT statements, but would this give me a large performance increase > over doing this progammatically as i've got it? > > Unless i've missed something obvious which could well be the case! > > > After trying several methods to improve the SQL the only thing that really made a difference was creating an index on the ids. Using a UNION ALL did improve matters, but you end up have to concatenate a very long string for the query, so if anyone does have any SQL ideas i'd like to hear them.
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