Question

I have the following tables

Payment

PayTypeId, Description

• 0 , Credit
• 1, Debit
• 2,Master

ActualPayment
Id,PayTypeId,Amount

• 1,1,10

Here is the output i am looking at

Id,PayTypeId,Amount

• 1,0,NULL
• 1,1,10
• 1,2,NULL

Basically I want all the records of ActualPayment including all payment types.

Here is the query i have used but am not getting any records

select
*
from #ActualPayments ap 
left join #Payment p on ap.paytypeid = p.paytypeid 
where p.paytypeid is null

Answer 1

If you want one record for each of the three PayTypeID values, then you need those three records on the left-hand side of the LEFT JOIN.

Equally, if you want the ActuallPaymentID on each output line, that value needs to be on the left hand side.

It’s all leading you down the wrong avenue with the data that you have, and the tables that you have described.

With just those two tables in your question, I would use this layout instead…

SELECT
  ap.ActualPaymentID,
  p.PayTypeID,
  SUM(CASE WHEN ap.PayTypeID = p.PayTypeID THEN ap.Amount END)    AS Amount
FROM
  ActualPayments                    AS ap
CROSS JOIN
  Payment                           AS p
GROUP BY
  ap.ActualPaymentID,
  p.PayTypeID