如何分隔SQL中的字段并从该字段创建单独的行？

Question

我在SQL Server中的字段，有时可以包含文本通过管道这样的分离：

COLOUR 
Red 
Blue|Red|Yellow 
Green|White 
Yellow 

我想创建这样的：

COLOUR   SUBCOLOUR 
Red    Red 
Blue|Red|Yellow Blue 
Blue|Red|Yellow Red 
Blue|Red|Yellow Yellow 
Green|White  Green 
Green|White  White 
Yellow   Yellow 

任何人有什么想法？

谢谢

Answer 1

通过分割功能就可以达到预期的结果集

declare @t table (Colour varchar(50)) 
    insert into @t (Colour) 
    values 
    ('Red'), 
    ('Blue|Red|Yellow'), 
    ('Green|White'), 
    ('Yellow') 



;with cte as (
    SELECT Colour As Colour , 
     Split.a.value('.', 'VARCHAR(100)') AS SubColour 
    FROM (SELECT Colour, 
      CAST ('<M>' + REPLACE([Colour], '|', '</M><M>') + '</M>' AS XML) AS String 
     FROM @t) AS A CROSS APPLY String.nodes ('/M') AS Split(a)) 

     select * from cte 

Answer 2

未经测试，但有评论。使用变量和游标，所以只会建议如果这不是一个大表，你只做一次。我会很乐意提供更多的解释，如果这并不为你工作：

CREATE TABLE NewTable (Colour varchar(50),SubColour varchar(50)) 

SELECT Colour, LEN(Colour) - LEN(REPLACE(Colour,'|','')) AS delimCount 
INTO #temp FROM [ColourTable] 

DECLARE @i int 
DECLARE @delimLoc int 
DECLARE @Colour varchar(50) 
DECLARE @subColour varchar(50) 
DECLARE ColourCursor CURSOR FOR SELECT * FROM #temp; 
OPEN ColourCursor; 

通过表

WHILE @@FETCH_STATUS = 0 
BEGIN 

FETCH NEXT FROM ColourCursor INTO @Colour; 
SET @i = 1 
SET @delimLoc = 0 
IF delimCount > 0 

BEGIN 
WHILE @i <= delimCount 

环路去逐行创建subcolor从最后的位置去使用'|' （或色域的开始。如果@i = 1）

BEGIN 
SET @subColour = SUBSTRING(@Colour,@delimLoc+1,CHARINDEX(@Colour,'|',@delimLoc+1)) 
INSERT INTO NewTable VALUES (@Colour,@subColour) 
SET @i = @i + 1 
SET @delimLoc = @delimLoc + CHARINDEX(@Colour,'|',@delimLoc+1) 
END 

END 

END 

CLOSE ColourCursor 
DEALLOCATE ColourCursor;