三表连接
SELECT a.ZDID,a.ZDname,a.ZDIP,a.Remark,b.eventtime,c.checkTime from (ZDList as a left join ZDEvents as b on a.zdid=b.zdid )left join ZDcheckchangerecord_old as c on a.zdid=c.zdid
VB中队Access数据库表的连接操作
原文：http://www.cnblogs.com/xbj-hyml/p/7698537.html
