I have Two tables :
Table1, Table2
I have to write a SQL query which has inner join on three columns based on <> 0 condition on these tables. My condition is
if(table1.ID != 0), then inner join on table1.ID = table2.ID else,
if(table1.MemberID != 0), then inner join on table1.MemberID = table2.MemberID else,
inner join on table1.PersonID = table2.PersonID
You can use a conditional statement (case when for example) in a join clause.
select t1.*, t2.*
from table1 t1
inner join table2 t2 on
(case when
t1.ID != 0
then t1.ID =t2.Id
else
case when t1.MemberId !=0
then t1.MemberId = t2.MemberId
else
t1.PersonId = t2.PersonId
end
end)
see SqlFiddle
This should work.
select *
from Table1, Table2
where table1.Personid = table2.personId
and (((Table1.id != 0) and (Table1.id = table2.Id))
or ((Table1.memberid != 0) and (Table1.memberid = table2.memberId)))
