Question

I need to cross reference 2 tables.

within tb1 is booking_ref, investor

within tb2 is booking_ref, investor, cost

The trouble is if there in no cost, no record is created in table 2

So I have the following query…

SELECT 
  tb1.booking_ref, tb1.investor, tb2.cost 
FROM 
  tb1, tb2 
WHERE 
  tb1.booking_ref = tb2.booking_ref 
AND 
  tb1.investor = tb2.investor 
AND 
  tb1.investor = ''12345''

this displays all bookings where there is a matching booking_ref in tb2 but I also need to display bookings where there is not a matching booking_ref

any ideas??

Answer 1

You want a left join in this case.

SELECT 
  tb1.booking_ref, tb1.investor, tb2.cost 
FROM 
  tb1
      left join tb2 
          on tb1.booking_ref = tb2.booking_ref
              and tb1.investor = tb2.investor 
WHERE tb1.investor = ''12345''