sql - sql查询查找不在其他表中的记录

Question

我有一个plist带有 column的表list，其中包含逗号分隔的 id (1,2,3,4)。我想要那些 id 不在逗号分隔列表中的成员的记录。

Answer 1

最好的方法是将逗号分隔的列表拆分为一个表，然后对其进行搜索。

这是拆分字符串的代码：

DECLARE @YourTable table (RowID int, Layout varchar(200))
INSERT @YourTable VALUES (1,'1,2,3,4')

;WITH SplitSting AS
(
    SELECT
        RowID,LEFT(Layout,CHARINDEX(',',Layout)-1) AS Part
            ,RIGHT(Layout,LEN(Layout)-CHARINDEX(',',Layout)) AS Remainder
        FROM @YourTable
        WHERE Layout IS NOT NULL AND CHARINDEX(',',Layout)>0
    UNION ALL
    SELECT
        RowID,LEFT(Remainder,CHARINDEX(',',Remainder)-1)
            ,RIGHT(Remainder,LEN(Remainder)-CHARINDEX(',',Remainder))
        FROM SplitSting
        WHERE Remainder IS NOT NULL AND CHARINDEX(',',Remainder)>0
    UNION ALL
    SELECT
        RowID,Remainder,null
        FROM SplitSting
        WHERE Remainder IS NOT NULL AND CHARINDEX(',',Remainder)=0
)
SELECT RowID,part FROM SplitSting ORDER BY RowID