我有表结构:
A | B | C |日期
我想选择MAX(A),MAX(B),MAX(C)和每个MAX赋值日期...可以在MySQL中只用1个SELECT(没有像SELECT * FROM这样的时态表) SELECT ....))?
示例:
A | B | C | Date
------------------------
10 | 20 | 0 | 25.5.2012
0 | 13 | 7 | 25.3.2012
70 | 5 | 15 | 25.4.2012
Result:
A -> 70 - 25.4.2012
B -> 20 - 25.5.2012
C -> 15 - 25.4.2012
答案 0 :(得分:1)
( SELECT 'A' AS ColumnM
, a AS Result
, Date
FROM tableX
ORDER BY a DESC
LIMIT 1
)
UNION ALL
( SELECT 'B'
, b
, Date
FROM tableX
ORDER BY b DESC
LIMIT 1
)
UNION ALL
( SELECT 'C'
, c
, Date
FROM tableX
ORDER BY c DESC
LIMIT 1
) ;
答案 1 :(得分:0)
我认为你需要这个::
Select
MAX(a),
MAX(b),
MAX(c)
from table
GROUP BY `Date`