Question

我需要选择不重复的值，从不重复，使用distinct不是解决方案。我需要显示更多来自行的字段，而不是用于分组。

我的查询只显示一个字段：

SELECT NIPL
FROM KONTRAHENT  GROUP BY NIPL HAVING (COUNT(NIPL)=1) 
ORDER BY NIPL DESC

表：

id | NIPL
 1 | 230
 2 | 450   <- I want to select only this row
 3 | 230
 3 | 123
 4 | 123

现在我的选择仅返回NIPL。简单地将id添加到statment不是woking。经过长时间的谷歌搜索，我放弃了。我需要你的帮助:)

Answer 1

您只需要使用子查询。

像这样：

SELECT * 
FROM KONTRAHENT
WHERE NIPL IN 
(
   SELECT NIPL
   FROM KONTRAHENT
   GROUP BY NIPL
   HAVING COUNT(NIPL)=1 
)
ORDER BY NIPL DESC

或者这个：

SELECT * 
FROM KONTRAHENT
JOIN 
(
   SELECT NIPL
   FROM KONTRAHENT
   GROUP BY NIPL
   HAVING COUNT(NIPL)=1 
) AS SUB ON KONTRAHENT.NIPL = SUB.NIPL
ORDER BY KONTRAHENT.NIPL DESC

或（在允许CTE的系统中）：

WITH SUB AS
(
   SELECT NIPL
   FROM KONTRAHENT
   GROUP BY NIPL
   HAVING COUNT(NIPL)=1 
) 
SELECT * 
FROM KONTRAHENT
JOIN SUB ON KONTRAHENT.NIPL = SUB.NIPL
ORDER BY KONTRAHENT.NIPL DESC

MSSQL 2008 - 仅选择列具有从不重复的唯一值的行

1 个答案: