实现类似mysql group_concat的功能
SELECT SG.Id ,SG.GroupName ,HostNames = STUFF((SELECT ‘,‘ + SH.[HostName] FROM SaltHost SH WHERE SG.Id = SH.HostGroupId FOR XML PATH(‘‘), TYPE).value(‘.‘, ‘NVARCHAR(MAX)‘), 1, 1, ‘‘) FROM [SaltGroup] SG ORDER BY SG.Id
原文：http://www.cnblogs.com/kaynet/p/6287695.html