更新sql server 2005中的表的查询

Question

我有一张名为employees的表

empID name   startdate       Middate      DEptID
1     kumar  2011-04-30      2005-09-13    1
2     kiran  2011-05-23      2006-08-13    1
3     kishor 2008-04-13      2009-04-23    6
4     anu    2009-09-03      2000-06-13    1
5     priya  2010-05-04      2010-04-13    6
6     sweth  2011-07-13      2007-12-16    1
7     manu   2011-08-15      2006-12-07    6

有没有办法可以更新此表 startdate =所有员工的Middate

empID name   startdate       Middate      DEptID
1     kumar  2005-09-13      2005-09-13    1
2     kiran  2006-08-13      2006-08-13    1
3     kishor 2009-04-23      2009-04-23    6
4     anu    2000-06-13      2000-06-13    1
5     priya  2010-04-13      2010-04-13    6
6     sweth  2007-12-16      2007-12-16    1
7     manu   2006-12-07      2006-12-07    6

请告诉我如何解决这个问题

感谢
王子

Answer 1

update employees set startdate=middate