有三张表：
te_vehicletarget
tr_tmn_vehicle
te_terminal
我要查询的是
te_vehicletarget表下的
te_vehicletarget.reg_date，te_vehicletarget.open_date，te_vehicletarget.close_date；
tr_tmn_vehicle表下的
tr_tmn_vehicle.bindtime
where条件 tr_tmn_vehicle.SU_MDN = ' ';
关联为：te_vehicletarget.ID = tr_tmn_vehicle.VHC_ID;
te_terminal.ID = tr_tmn_vehicle.TMn_ID
但是我想了一下午也没有想明白！
------解决方案--------------------
select
te_vehicletarget.reg_date，te_vehicletarget.open_date，te_vehicletarget.close_date
from
te_vehicletarget,
tr_tmn_vehicle,
te_terminal
where te_vehicletarget.ID = tr_tmn_vehicle.VHC_ID;
and te_terminal.ID = tr_tmn_vehicle.TMn_ID
and tr_tmn_vehicle.SU_MDN = ' '
------解决方案--------------------
你表结构也没有。。。各个字段也没描述，不知下面的是不是你要的
- SQL code
SELECT te_vehicletarget.reg_date,te_vehicletarget.open_date,te_vehicletarget.close_date, tr_tmn_vehicle.bindtimeFROM ttr_tmn_vehicle,te_terminal,e_vehicletarget where tr_tmn_vehicle.SU_MDN = ' ' AND te_vehicletarget.ID = tr_tmn_vehicle.VHC_ID AND te_terminal.ID = tr_tmn_vehicle.TMn_ID
------解决方案--------------------
te_vehicletarget m条
tr_tmn_vehicle n条
te_terminal p条
做连接m*n*p条，
where条件，就是将这m*n*p条数据中的每条数据进行过滤，符合的留下，不符合的过滤……
------解决方案--------------------
select a.te_vehicletarget.reg_date,a.te_vehicletarget.open_date,a.te_vehicletarget.close_date,b.tr_tmn_vehicle.bindtime
from
te_vehicletarget a,tr_tmn_vehicle b,te_terminal c
where
a.te_vehicletarget.ID = b.tr_tmn_vehicle.VHC_ID
and
a.te_terminal.ID = b.tr_tmn_vehicle.TMn_ID
and
b.tr_tmn_vehicle.SU_MDN = ''