PHP语法的初学者，mySQL_query错误

Question

I'm attempting to make a page that is just a CREATE VIEW using DreamWeaver CS5. How do I need to input my code to just receive a table with all data relevant to the logged in user.

mysql_query(
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)

Answer 1

您必须将查询放在引号中以使其成为字符串。

mysql_query("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")

Answer 2

Daniel is correct about the quotes. However, you should probably take a look at PDO , the mysql_ functions are a bit outdated. You can read more about that here .

Answer 3

• 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