求一条统计用的sql
mh:工时 mhtype:工时类型（6种）
字段：userid mhtype mh
001 1 5
001 1 3
001 2 4
001 3 9
002 5 5
002 6 7
002 3 4
002 3 9
要求统计出每个人每一类工时的总合
结果要求如下格式
userid mhtype1 mhtype2 mhtype3 mhtype4 mhtype5 mhtype6 allmh
001 8 4 9 0 0 0 21
002 0 0 13 0 5 7 25
-
SQL code
create table lk4(
userid mediumint(3) unsigned zerofill not null,
mhtype int not null,
mh int not null);
insert into lk4 values
(001,1,5),
(001,1,3),
(001,2,4),
(001,3,9),
(002,5,5),
(002,6,7),
(002,3,4),
(002,3,9);
select userid,
sum((case when mhtype=1 then mh else 0 end )) as 'mhtype1',
sum((case when mhtype=2 then mh else 0 end )) as 'mhtype2',
sum((case when mhtype=3 then mh else 0 end )) as 'mhtype3',
sum((case when mhtype=4 then mh else 0 end )) as 'mhtype4',
sum((case when mhtype=5 then mh else 0 end )) as 'mhtype5',
sum((case when mhtype=6 then mh else 0 end )) as 'mhtype6',
sum(mh) as 'allmh'
from lk4 group by userid;
