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from tad_assigntask ta,tai_userinfo ti,tad_tasks ts,tad_taskgrp tg where ta.operator_id=ti.user_id
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select a.operatorid,isnull(a.task_id,a.taskgrp_id) task,isnull(b.name,c.taskgrp_name) [name] from ÈÎÎñ·ÖÅä±í a
left join ÈÎÎñ±í b
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