Question

i have three table to join in select query .. this query not working

select policy_master.POLICY_REFER ,policy_master.CLIENT_NAME ,policy_master.ADRESS ,policy_master.POLICY_CLASS ,policy_master.POLICY_PRODUCT ,policy_master.EXECUTIVE_NAME ,policy_master.COMM_DATE ,
policy_master.EXPIRY_DATE ,policy_master.RENEWAL_DATE ,policy_master.GROSS ,policy_master.FED ,policy_master.FIF ,policy_master.STAMP_DUTY ,policy_master.PERMIUM ,policy_master.DESCRIPTION, 
POLICY_INSURER_DETAIL.INSURER_NAME,POLICY_INSURER_DETAIL.POLICY_NUMBER,POLICY_INSURER_DETAIL.P_SHARE,POLICY_INSURER_DETAIL.G_PREMIUM,POLICY_INSURER_DETAIL.BROKER_P,POLICY_INSURER_DETAIL.LEVY,
POLICY_INSURER_DETAIL.LEVY,POLICY_SUBAGENT_DETAIL.SUBAGENT_NAME,POLICY_SUBAGENT_DETAIL.BUSSINES_SHARE,POLICY_SUBAGENT_DETAIL.COMM_P,POLICY_SUBAGENT_DETAIL.COMM_VALUE
from POLICY_MASTER INNER JOIN POLICY_INSURER_DETAIL 
on policy_master.policy_refer = POLICY_INSURER_DETAIL.POLICY_REFER and
policy_master.policy_refer = POLICY_SUBAGENT_DETAIL.POLICY_REFER;

Please tell me what i should do

Answer 1

To simplify the answer I've removed all explicit columns and replaced them with select *.

You have only joined two tables. You are refering to policy_subagent_detail table inside a join to policy_insurer_detail (but you're not joining the subagent details table). You should join this table and specify joining conditions in order to be able to retrieve columns from it (as you did in your column list near select keyword).

I've also added table aliases to make your code shorter.

select *
from POLICY_MASTER pm
inner join POLICY_INSURER_DETAIL pid on 
  pm.policy_refer = pid.POLICY_REFER
inner join POLICY_SUBAGENT_DETAIL psd on -- added join
  pm.policy_refer = psd.POLICY_REFER

Answer 2

对第三张表进行内部连接，要求您在from子句中错过它。就是这样。或者您可以使用

之类的where子句

from table1 a,table2 b,table3 c
where a.colname= b.colname and
            b.colname=c.colname.

join three table in oracle 11g

2 个答案: