如何將行值轉換爲單個字符串

Question

我有一條select語句並返回一列，但返回多行。我想用下面的逗號將它轉換爲單個字符串。

SELECT CODE FROM LG_xxx_CLCARD WHERE CODE < 'KUR' AND CODE > 'CARI1' 

這將返回

ASD1 
ASD2 
ASD3 

我想將其轉換爲

'ASD1','ASD2','ASD3' 

我怎樣才能做到這一點的SQL？

Answer 1

使用STUFF函數：

SELECT STUFF(
    (SELECT ',' + CODE 
    FROM LG_xxx_CLCARD 
    WHERE CODE < 'KUR' AND CODE > 'CARI1' 
    ORDER BY CODE 
    FOR XML PATH ('')), 1, 1, '') 

如果需要單引號，那麼下面會做的伎倆：

SELECT STUFF(
    (SELECT ',' + '''' + CODE + '''' 
    FROM LG_xxx_CLCARD 
    WHERE CODE < 'KUR' AND CODE > 'CARI1' 
    ORDER BY CODE 
    FOR XML PATH ('')), 1, 1, '') 

Answer 2

declare @tmp varchar(250) 
SET @tmp = '' 
select @tmp = @tmp + CODE + ', ' from LG_xxx_CLCARD 
          WHERE CODE < 'KUR' AND CODE > 'CARI1' 

Answer 3

試試這個：

SELECT LISTAGG(CODE , ',') WITHIN GROUP (ORDER BY CODE) FROM LG_xxx_CLCARD WHERE CODE < 'KUR' AND CODE > 'CARI1' 

結果應該是

'ASD1'，'ASD2'，'ASD3'，..