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drop table if exists t1;
create table t1 (One int unsigned, Two int unsigned, Three int unsigned, Four int unsigned);
insert into t1 values (1,2,1,4);
insert into t1 values (1,2,2,4);
insert into t1 values (1,2,3,4);
insert into t1 values (1,2,4,4);
insert into t1 values (1,1,1,4);
insert into t1 values (1,1,2,4);
insert into t1 values (1,1,3,4);
insert into t1 values (1,1,4,4);
insert into t1 values (1,3,1,4);
insert into t1 values (1,3,2,4);
insert into t1 values (1,3,3,4);
insert into t1 values (1,3,4,4);
select One, Two, sum(Four) from t1 group by One,Two;
drop table if exists t1;
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