在sql server中，您可以使用FOR XML PATH
select SubscriberId,
categoriesAdded=Stuff((SELECT ',' + CAST(CategoryId as VARCHAR(255)) FROM catsToAdd t1 WHERE t1.SubscriberId=@categoriesToAdd.SubscriberId
FOR XML PATH (''))
, 1, 1, '' )
from @categoriesToAdd as catsToAdd
GROUP BY SubscriberId
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