Question

I have the following little bit of MySQL code

CREATE VIEW UserResults AS 
   SELECT E.No, E. Description
      , Count(R.RID WHERE $Username= R.Owner)
      , Count(R.RID WHERE $Username= R.Owner AND Status==’Active’ ) 
   FROM ETable AS E, RTABLE as R
   ORDER BY E.No)

but MySQL is returning a syntax error that I can’t seem to find. Also when I have created this view, how can I make it viewable?

Answer 1

• You have an extra ending parenthesis, which should be removed
• Views should not have ORDER BY.
• The WHERE clause should not be in the middle of the SELECT, you will need to use a CASE.
• You are returning a Cartesian product instead of joining your tables together, this may provide more results than you want/expect.

The R.RID in the THEN block of the CASE statements may need to be a 1, not entirely sure what you hoped to get from those COUNT statements you originally had.

I tried to figure out what you were trying to do, and I think this is it:

CREATE VIEW UserResults AS
   SELECT E.No, E.Description
      , SUM(CASE 
               WHEN $Username = R.Owner THEN R.RID
               ELSE 0
            END) AS SumOfOwner
      , SUM(CASE
               WHEN $Username = R.Owner AND Status = 'Active' THEN R.RID
               ELSE 0
            END) AS SumOfOwnerAndActive
   FROM ETable AS E
   INNER JOIN RTABLE as R ON E.No = R.ENo
   GROUP BY E.No, E.Description