Left Outer Join with a subquery not executing oracle

Question

I am trying to make a query for that contains left outer join and a query that contains a sub query. I tried the following code:

select c.CustomerName,l.Way,l.Travel
from (select l.HomeAdd from tbl_Location l
where l.HomeAdd like '%Colombo%') from
tbl_Customer c left outer join tbl_Location l
on (l.location_id=c.location_id);

I get the following error message

tbl_Customer c left outer join tbl_Location l
         *
ERROR at line 4:
ORA-00933: SQL command not properly ended

Please help!!!

Answer 1

Very strange query. I assume you intend:

select c.CustomerName, l.Way, l.Travel
from tbl_Customer c left outer join
     tbl_Location l
     on l.location_id = c.location_id and l.HomeAdd like 'Colombo%';

The problem with your query is you have subquery in the where clause. There is no comparison -- not = , no exists , no in , nothing that represents a boolean expression.

Answer 2

It looks like you are missing EXISTS keyword in the query

select c.CustomerName,l.Way,l.Travel
from tbl_Customer c left outer join tbl_Location l
on (l.location_id=c.location_id)
where EXISTS (
  select l.HomeAdd from tbl_Location l
  where l.HomeAdd like 'Colombo%'
);

Answer 3

If you insist upon using a subquery I suggest you do something like:

select c.CustomerName,
       l.Way,
       l.Travel
from tbl_Customer c
left outer join (SELECT l.HOMEADD,
                        l.WAY,
                        l.TRAVEL
                 FROM tbl_Location
                 WHERE l.HOMEADD LIKE 'Colombo%') l
  on l.location_id=c.location_id

Also, a comment: I strongly suggest that you should not prefix the names of tables etc, with something like 'TBL_'. When tables, etc, are used the context of the usage tells you what the object is. Oracle identifiers are limited to 30 characters - IMO sacrificing 13% of the available name length to a prefix is simply wasteful.

Best of luck.