Question

我有一个存储过程...它有一个参数：@subCustName。此存储过程有一个带group by custName, subCustName

的select语句

例如：

SELECT custName, subCustName,sum(membership)
FROM CUSTOMER_TABLE
GROUP BY
custName, subCustName

如果参数@subCustName为'ALL'，我不想按subCustName分组。

我该怎么做？

提前致谢！

Answer 1

CASE声明中的小组？

SELECT
    CASE WHEN @custName = 'all' THEN '' ELSE custName END AS custName,
    subCustName, sum(membership)
FROM  
    CUSTOMER_TABLE
GROUP BY
    CASE WHEN @custName = 'all' THEN '' ELSE custName END, subCustName

我在这里回答的另一个例子：SQL Server 2005/2008 Group By statement with parameters without using dynamic SQL?

Answer 2

像这样的东西

IF (@subCustName = 'ALL')
    SELECT custName, subCustName, 1
    FROM CUSTOMER_TABLE
ELSE
    SELECT custName, subCustName, sum(membership)
    FROM CUSTOMER_TABLE
    GROUP BY custName, subCustName

或者您可以动态构建查询

我们可以在sql server中有动态group by子句吗？

2 个答案: