sql 语句
表T
A B C
1 3 3
2 4 7
3 6 10
SELECT A,B FROM T WHERE C BETWEEN 1 TO 8
输出
A B
1 3
2 4
SELECT A,B FROM T WHERE C BETWEEN 4 TO 12
输出
A B
2 4
3 6
有没有办法使的用一个SQL语句使的输出为
输出
A B A B
1 3 2 4
2 4 3 6
[解决办法]
SELECT (case when C BETWEEN 1 TO 8 then A end ) as A,(case when C BETWEEN 1 TO 8 then B end ),(case when C BETWEEN 4 TO 12 then A end ) as A,(case when C BETWEEN 4 TO 12 then B end ) as B FROM T
[解决办法]
select A1 = max(case when C between 1 and 8 then A else null end),
B1 = max(case when C between 1 and 8 then B else null end),
A2 = max(case when C between 4 and 12 then A else null end),
B2 = max(case when C between 4 and 12 then B else null end)
from T
這樣?
另外,列名不能重複
