从结果中删除第一个逗号

Question

DECLARE @WithdrawnClasses VARCHAR(MAX) = ''
SELECT @WithdrawnClasses = COALESCE(@WithdrawnClasses + ', ', '') + fcd.ClassNbr
FROM XR.FrmCM9Details fcd
INNER JOIN XR.FrmCM9 fc ON fcd.FrmCM9FK = fc.Id
AND fc.FrmMstFK = '00775549-4EB9-478B-AFD5-5667BD9AA7EE'
SELECT @WithdrawnClasses

如果我运行此查询，我将返回输出为，01,03,05,29,35

那么有什么方法可以使用上面的查询修剪第一个逗号。所以结果应该是01,03,05,29,35

Answer 1

请尝试：

select @WithdrawnClasses =STUFF(@WithdrawnClasses , 1, 1, '')

或删除变量@WithdrawnClasses

的assign语句

DECLARE @WithdrawnClasses VARCHAR(MAX)
SELECT 
  @WithdrawnClasses = COALESCE(@WithdrawnClasses + ', ', '') + fcd.ClassNbr
FROM XR.FrmCM9Details fcd
INNER JOIN XR.FrmCM9 fc ON fcd.FrmCM9FK = fc.Id
  AND fc.FrmMstFK = '00775549-4EB9-478B-AFD5-5667BD9AA7EE'

Answer 2

SELECT @WithdrawnClasses=SUBSTRING(@WithdrawnClasses,1,LEN(@WithdrawnClasses)-1)