SQL Sever中多列拼接成一列值为NULL
查询出数据
SELECT a.ID AS KYMain_ID ,
',' + a.Leader + ',' AS KYMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_KYChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.Single_Leader)
FROM TB_KYSubProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYSub_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.KY_KCUser)
FROM TB_KYSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYTask_Leader ,
',' + b.Leader + ',' AS SJMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_SJChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SJ_User)
FROM TB_SJSubProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJSub_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SJ_KCUser)
FROM TB_SJSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJTask_Leader ,
',' + c.Leader + ',' AS SGMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_SGChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SG_U_User)
FROM TB_SGSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGTask_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SG_KCUser)
FROM TB_SGSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGTask_KCLeader
FROM TB_KYMainProject a
LEFT JOIN TB_SJMainProject b ON b.ID = a.ID
LEFT JOIN TB_SGMainProject c ON c.ID = a.ID
WHERE ISNULL(a.IsDelete, 0) = 0
AND ISNULL(b.IsDelete, 0) = 0
AND ISNULL(c.IsDelete, 0) = 0
然后业务需要，把多列拼接成一列，但显示NULL
SELECT [KYMain_Leader] + [KYChild_Leader] + [KYSub_Leader] + [KYTask_Leader]+ [SJMain_Leader] + [SJChild_Leader] + [SJSub_Leader]+ [SJTask_Leader] + [SGMain_Leader] + [SGChild_Leader]+ [SGTask_Leader] + [SGTask_KCLeader]
FROM ( SELECT a.ID AS KYMain_ID ,
',' + a.Leader + ',' AS KYMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_KYChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.Single_Leader)
FROM TB_KYSubProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYSub_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.KY_KCUser)
FROM TB_KYSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYTask_Leader ,
',' + b.Leader + ',' AS SJMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_SJChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SJ_User)
FROM TB_SJSubProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJSub_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SJ_KCUser)
FROM TB_SJSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJTask_Leader ,
',' + c.Leader + ',' AS SGMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_SGChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SG_U_User)
FROM TB_SGSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGTask_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SG_KCUser)
FROM TB_SGSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGTask_KCLeader
FROM TB_KYMainProject a
LEFT JOIN TB_SJMainProject b ON b.ID = a.ID
LEFT JOIN TB_SGMainProject c ON c.ID = a.ID
WHERE ISNULL(a.IsDelete, 0) = 0
AND ISNULL(b.IsDelete, 0) = 0
AND ISNULL(c.IsDelete, 0) = 0
) vv
解决方法：
null加减乘除任何值都等于null，所以使用isnull函数先处理下列的值再拼接
SELECT ISNULL([KYMain_Leader], '') + ISNULL([KYChild_Leader], '')
+ ISNULL([KYSub_Leader], '') + ISNULL([KYTask_Leader], '')
+ ISNULL([SJMain_Leader], '') + ISNULL([SJChild_Leader], '')
+ ISNULL([SJSub_Leader], '') + ISNULL([SJTask_Leader], '')
+ ISNULL([SGMain_Leader], '') + ISNULL([SGChild_Leader], '')
+ ISNULL([SGTask_Leader], '') + ISNULL([SGTask_KCLeader], '')
FROM ( SELECT a.ID AS KYMain_ID ,
',' + a.Leader + ',' AS KYMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_KYChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.Single_Leader)
FROM TB_KYSubProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYSub_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.KY_KCUser)
FROM TB_KYSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS KYTask_Leader ,
',' + b.Leader + ',' AS SJMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_SJChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SJ_User)
FROM TB_SJSubProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJSub_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SJ_KCUser)
FROM TB_SJSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SJTask_Leader ,
',' + c.Leader + ',' AS SGMain_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.TaskLeader)
FROM TB_SGChildProject b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGChild_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SG_U_User)
FROM TB_SGSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGTask_Leader ,
STUFF(( SELECT ',' + CONVERT(VARCHAR(36), b.SG_KCUser)
FROM TB_SGSubTask b
WHERE b.MainProjectID = a.ID
AND ISNULL(b.IsDelete, 0) = 0
FOR
XML PATH('')
), 1, 0, '') + ',' AS SGTask_KCLeader
FROM TB_KYMainProject a
LEFT JOIN TB_SJMainProject b ON b.ID = a.ID
LEFT JOIN TB_SGMainProject c ON c.ID = a.ID
WHERE ISNULL(a.IsDelete, 0) = 0
AND ISNULL(b.IsDelete, 0) = 0
AND ISNULL(c.IsDelete, 0) = 0
) vv
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