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mysql 更新有关问题

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Release： 2016-06-13 12:47:51
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mysql 更新问题
UPDATE cg_disease_department AS a SET a.department_id = 
  SELECT department_id FROM cg_department AS b WHERE a.department_name = b.name

我的需求是 将b表的departmentid 更新到 a表的departmentid 条件是 a.department_name = b.name

我这sql问题在那

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