Question

我在SQL中遇到问题我将尝试简要解释

TABLENAME：示例

Customer name | ProductClass
-----------------------------
 A            | Accessory
 B            | Accessory
 B            | Bicycle
 C            | Bicycle

我的目标： 仅显示客户B的2行。因此，让查询仅显示具有2个ProductClass值的客户

如果我尝试

Select *
From Example
WHERE ProductClass LIKE 'Accessory'
AND ProductClass LIKE 'Bicycle'

我没有结果

如果我尝试

Select *
From Example
WHERE ProductClass LIKE 'Accessory'
OR ProductClass LIKE 'Bicycle'

我得到了所有4行。

Answer 1

Select [Customer name]
From Example
group by [Customer name]
having count(distinct ProductClass) > 1

如果你想获得整行，那么你可以使用

SELECT *
FROM Example 
WHERE [Customer name] in (
   Select [Customer name]
   From Example
   group by [Customer name]
   having count(distinct ProductClass) > 1
)

Answer 2

试试这个：

SELECT * FROM Example e
INNER JOIN (
    Select CustomerName, COUNT(*) AS ProdClassCount
    From Example
    GROUP BY CustomerName
    HAVING COUNT(*) = 2 -- OR Maybe > 1
) x ON x.CustomerName = e.CustomerName

Answer 3

显示具有2个ProductClass值的客户

SELECT *
FROM Example e
INNER JOIN 
(
   select [customer name]
   from example
   group by [customer name]
   having count(*) = 2
) c on c.[customer name] = e.[customer name]

Answer 4

如何使用SQL INTERSECT？

SELECT * FROM Example WHERE ProductClass LIKE 'Accessory'
INTERSECT
SELECT * FROM Example WHERE ProductClass LIKE 'Bicycle'

SQL：WHERE＆amp; AND语句问题

4 个答案: