Question

如果两个标准的结果相等，则从CODE行中选择值。条件示例：

DAYS = 30，RATE 2 和 DAYS = 60，RATE 0

表

 ID | CODE| DAYS| RATE|
  1 | 01  | 30  | 2   |
  2 | 05  | 20  | 3   |
  3 | 01  | 60  | 0   |
  4 | 06  | 30  | 3   | 
 ...

第一部分是

SELECT * FROM Tablename WHERE (DAYS = 30 AND RATE = 2)

但是第二部分......封装了吗？

结果应为01

有什么建议吗？ thx提前。

Answer 1

SELECT DISTINCT CODE FROM Tablename 
WHERE (DAYS = 30 AND RATE = 2)
OR (DAYS = 60 AND RATE = 0)

Answer 2

您需要自我加入：

SELECT DISTINCT t1.code
FROM Tablename t1
INNER JOIN Tablename t2 
ON t1.code = t2.code
WHERE t1.days = 30 AND t1.rate = 2
AND t2.days = 60 AND t2.rate = 0

Answer 3

试试这个，

SELECT * FROM Tablename WHERE (DAYS = 30 AND RATE = 2) OR (DAYS = 60 AND RATE = 0)

如果两个标准的结果相等，则选择一个值

3 个答案: