> The statement proposed by Lawrence (copied below) will work > if your table has only these two columns, A and B. > > SELECT MAX(A) AS A , B > FROM T > GROUP BY B > > From your question I got the imprssion you may have other > columns as well. > > For a table t like this; > > a|b|c > 1|5|6 > 2|5|7 > 3|5|8 > 10|6|7 > 4|6|10 > 3|2|5 > 4|2|6 > 7|6|13 > > An extended version of Lawrence's query gives; > > sqlite> select max(a), b,c from t group by b; > max(a)|b|c > 4|2|5 > 3|5|6 > 10|6|7 > > Which has the wrong values for the column c. It uses the > value of c from the first record in each group. There is no > record with values 4, 2, 5. > > You can get the correct rows with the following query which > is similar to Eric's proposal except that it is combined into > a single SQL statement. > > select t.* from t join (select max(a) as a, b from t group by > b) as key where t.a=key.a and t.b=key.b; > > Which will give the rows > > t.a|t.b|t.c > 3|5|8 > 10|6|7 > 4|2|6 > > This works, but I suspect there is probably a better way to do it. >
Thanks! I think that will work. At least it points me in the right direction. Tim
