> dear rhino and whil > thanks for that valuable tip. > but, dont i have to wory about the repeating id's (are they not > redundant...) in this table, excuse me if this query looks silly... > > PLANT_MOLECULE > plant_id molecule_id quantity > --------- -------------- -------- > 1 A 3.0E12 > 1 D 4.7E09 > 2 D 2.1E05 > 2 B 9.8E22 > 2 C 0.8E08 > 3 E 0.1E31 > 3 D 6.2E03
Well, yes, you do have to make sure that you don't have more than one row with the same plant_id/mol_id combination. IOW, you _don't_ want two rows that both have > plant_id molecule_id > --------- -------------- > 1 A > 1 A because then you'd get twice the number of plants/molecules as you wanted. -- Whil Moving to Linux: Freedom, Choice, Security, Opportunity http://www.hentzenwerke.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
