I have a 2 table: 1. tb1:
aa bb cc mdate 1 d1 2.5 2012-08-07 2 d2 3.3 2012-08-07 3 d1 6.4 2012-08-09 2. tb2: aa bb cc 1. d1 5.3 2. d2 7.6 mysql sql cmd is: select tb2.bb,tb2.cc,(max(tb1.mdate)-min(tb1.mdate)) as mmd,(mmd. max(tb1.mdate).cc-mmd. min(tb1.mdate).cc) as mmc from tb1,tb2 where tb2.bb in (select bb from tb1 where bb group by bb having count(bb)) ; I wanna the result is: bb cc mmd mmc d1 5.3 2 3.9 the result 3.9 mean is 6.4-2.5 , mdate 2012-08-09 - 2012-08-07 =2, and 6.4 - 2.5=3.9 how to get the result by sqm cmd? thanks. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
