Sql 如何使ORDERBY子句动态
我使用的是SQLServer2008,我希望根据输入的列名和排序顺序(asc/desc)对数据进行排序。如何使下面的查询动态Sql 如何使ORDERBY子句动态,sql,sql-server-2008,group-by,sql-order-by,Sql,Sql Server 2008,Group By,Sql Order By,我使用的是SQLServer2008,我希望根据输入的列名和排序顺序(asc/desc)对数据进行排序。如何使下面的查询动态 DECLARE @iColumnName VARCHAR(24); DECLARE @iSortOrder VARCHAR(10); SET @iColumnName = 'ReceiptLocation'; -- ReceiptLocation/DeliverLocation/NominationNbr SET @iSortOrder = 'DESC'; -- DES
DECLARE @iColumnName VARCHAR(24);
DECLARE @iSortOrder VARCHAR(10);
SET @iColumnName = 'ReceiptLocation'; -- ReceiptLocation/DeliverLocation/NominationNbr
SET @iSortOrder = 'DESC'; -- DESC / ASC
SELECT sum(NominationNbr)
,sum(ReceiptLocation)
,sum(DeliverLocation)
FROM tables
GROUP BY NominationNbr
,ReceiptLocation
,DeliverLocation
ORDER BY CASE @iColumnName
WHEN 'ReceiptLocation'
THEN ReceiptLocation
WHEN 'DeliverLocation'
THEN DeliverLocation
ELSE NominationNbr
END
CASE @iSortOrder
WHEN 'DESC'
THEN DESC
ELSE ASC
END
你需要把两者结合起来。我建议使用这种相当笨拙的代码:
ORDER BY (CASE WHEN @iColumnName = 'ReceiptLocation' AND @iSortOrder = 'DESC'
THEN ReceiptLocation
END) DESC,
(CASE WHEN @iColumnName = 'ReceiptLocation'
THEN ReceiptLocation
END) ASC,
(CASE WHEN @iColumnName = 'DeliverLocation' AND @iSortOrder = 'DESC'
THEN DeliverLocation
END) DESC,
(CASE WHEN @iColumnName = 'DeliverLocation'
THEN DeliverLocation
END) ASC,
(CASE WHEN @iSortOrder = 'DESC'
THEN NominationNbr
END) DESC,
NominationNbr ASC
每个CASE
语句都是一个单独的顺序键。但是,如果值不匹配,则值为NULL
,因此该键不会执行任何不匹配的操作
您还可以使用动态SQL实现这一点。如果您有一个简单的查询和索引,可以用于ORDER BY
,那么这将更加有效