统计 武胜

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

createtable lk4( userid mediumint(3) unsigned zerofill notnull, mhtype intnotnull, mh intnotnull); insertinto 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((casewhen mhtype=1then mh else0end )) as'mhtype1', sum((casewhen mhtype=2then mh else0end )) as'mhtype2', sum((casewhen mhtype=3then mh else0end )) as'mhtype3', sum((casewhen mhtype=4then mh else0end )) as'mhtype4', sum((casewhen mhtype=5then mh else0end )) as'mhtype5', sum((casewhen mhtype=6then mh else0end )) as'mhtype6', sum(mh) as'allmh'from lk4 groupby userid;

结果：

+--------+---------+---------+---------+---------+---------+---------+-------+
| userid | mhtype1 | mhtype2 | mhtype3 | mhtype4 | mhtype5 | mhtype6 | allmh |
+--------+---------+---------+---------+---------+---------+---------+-------+
| 001 | 8 | 4 | 9 | 0 | 0 | 0 | 21 |
| 002 | 0 | 0 | 13 | 0 | 5 | 7 | 25 |
+--------+---------+---------+---------+---------+---------+---------+-------+
2 rows in set (0.00 sec)