Question

I have created a database for an imaginary solicitors, my last query to complete is driving me insane. I need to work out the total a solicitor has made in their career with the company, I have time_spent and rate to multiply and special rate to add. (special rate is a one off charge for corporate contracts so not many cases have them). the best I could come up with is the code below. It does what I want but only displays the solicitors working on a case with a special rate applied to it.

I essentially want it to display the result of the query in a table even if the special rate is NULL.

I have ordered the table to show the highest amount first so i can use ROWNUM to only show the top 10% earners.

CREATE VIEW rich_solicitors AS 
  SELECT notes.time_spent * rate.rate_amnt + special_rate.s_rate_amnt AS solicitor_made,          
        notes.case_id
   FROM notes, 
        rate, 
        solicitor_rate, 
        solicitor, 
        case, 
        contract, 
        special_rate
  WHERE notes.solicitor_id = solicitor.solicitor_id
    AND solicitor.solicitor_id = solicitor_rate.solicitor_id
    AND solicitor_rate.rate_id = rate.rate_id
    AND notes.case_id = case.case_id
    AND case.contract_id = contract.contract_id
    AND contract.contract_id = special_rate.contract_id
ORDER BY -solicitor_made;

Query:

SELECT * 
  FROM rich_solicitors
 WHERE ROWNUM <= (SELECT COUNT(*)/10 
                    FROM rich_solicitors)

Answer 1

you need to left join in the special rate.

If I recall the oracle syntax is like:

AND contract.contract_id = special_rate.contract_id (+) 

but now special_rate.* can be null so:

+ special_rate.s_rate_amnt

will need to be:

+ coalesce(special_rate.s_rate_amnt,0)