導讀:1建站知識SQL 比較一個集合是否在另一個集合里存在的方法分享，需要的朋友可以參考下。網站建設哪家好網站優化seo培訓。

復制代碼 代碼如下:

DECLARE @c INT DECLARE @c2 INT SELECT @c = COUNT(1) FROM dbo.SplitToTable('1|2|3|4', '|') SELECT @c2=COUNT(1) FROM dbo.SplitToTable('1|2|3|4', '|') a INNER JOIN dbo.SplitToTable('1|2|3|', '|') b ON a.value = b.value IF @c = @c2 SELECT 'ok' ELSE SELECT 'no' SplitToTable這個函數如下： set ANSI_NULLS ON set QUOTED_IDENTIFIER ON go ALTER FUNCTION [dbo].[SplitToTable] ( @SplitString NVARCHAR(MAX) , @Separator NVARCHAR(10) = ' ' ) RETURNS @SplitStringsTable TABLE ( [id] INT IDENTITY(1, 1) , [value] NVARCHAR(MAX) ) AS BEGIN DECLARE @CurrentIndex INT ; D網seo優化趨勢ECLARE @NextIndex INT ; DECLARE @ReturnText NVARCHAR(MAX) ; SELECT @CurrentInseo網站關鍵詞優化dex = 1 ; WHILE ( @CurrentIndex <= LEN(@SplitString) ) BEGIN SELECT @NextIndex = CHARINDEX(@Separator, @SplitString, @CurrentIndex) ; IF ( @NextIndex = 0 OR @NextIndex IS NULL ) SELECT @NextIndex = LEN(@SplitStrinseo網站優化培訓g) + 1 ; SELECT @ReturnText = SUBSTRING(@SplitString, @CurrentIndex, @NextIndex - @CurrentIndex) ; INSERT INTO @SplitStringsTable ( [value] ) VALUES ( @ReturnText ) ; SELECT @CurrentIndex = @NextIndex + 1 ; END RETURN ; END

關鍵詞標簽: 存在 標簽 SQL