1樓：樂動
mysql> select * from a;
+----+------+------+
| id | b | num |
+----+------+------+
| 1 | b1 | 200 |
| 2 | b1 | 300 |
| 3 | b1 | 400 |
| 4 | b2 | 120 |
| 5 | b2 | 920 |
+----+------+------+
5 rows in set (0.00 sec)mysql> select b,sum(num) from a group by b;
+------+----------+
| b | sum(num) |
+------+----------+
| b1 | 900 |
| b2 | 1040 |
+------+----------+
2 rows in set (0.00 sec)group by b的意思是根據b欄位來分組，後面的sum計算就是根據分組欄位的相同欄位來計算的。
2樓：
!echo"先去重複b的值，然後進臨時表"
select distinct b,num,id from ainto temp b1 with no log;!echo"然後計算出不重複的b，對應的num的總和"
unload to zongshuliang.txtselect sum(num)
from b1
不知道是不是你想要的啊？ 或是我把你的問題理解錯了，還有一個可能如下：
select distinct b,sum(num)from a
group by 1
3樓：
select b,sum(num) from (select b,sum(num) from table_name
group by b )
group by b
4樓：匿名使用者
用 distinct
select distinct b,sum(num) from table_name group by b
5樓：匿名使用者
select b, sum(num)
from 表a
group by b
6樓：
select distinct b,sum(num) from table_name
group by b
7樓：匿名使用者
select b,sum(num) from table_name
group by b
8樓：阿基米糊
select b,count(*) from a group by b
9樓：天堂上空的鷹
select b,sum(num) from a group by b
10樓：匿名使用者
select sum(b)
from a
group by b;
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