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1. 查询一个角色下面有多少用户
select * from SystemUser a join systemuserroles bon a.SystemUserId=b.SystemUserIdjoin Role con b.RoleId=c.RoleIdwhere c.Name=‘System Administrator‘and a.IsDisabled=0
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原文地址：http://www.cnblogs.com/fengwenit/p/4098360.html
