On Tue, Jan 12, 2010 at 04:00:51PM -0500, Qianqian Fang scratched on the wall: > hi > > My knowledge to sql is very limited. So forgive me if this sounds > really simple to you. I want to do a lookup operation with sqlite: > I have a table (id, value), where id is an index field, now I have > a list of ids, and I want to retrieve their values from the database > and separate them with ",". > > I know I can do a loop: for each id, "select value from mydata where > id='id_i'" > then concatenate the values after the loop. I somehow felt that > this will be very slow. I am wondering if there is a command > can do this lookup more efficiently.\
SELECT group_concat( value ) FROM mydata WHERE id IN ( 'id_1', 'id_2', ... ) -j -- Jay A. Kreibich < J A Y @ K R E I B I.C H > "Our opponent is an alien starship packed with atomic bombs. We have a protractor." "I'll go home and see if I can scrounge up a ruler and a piece of string." --from Anathem by Neal Stephenson _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
