Question

I have a question.
My database table is something like this:

---

| ID  | Name             | Value |  param  |
|  1  | Michael          | 290   |    X    |
|  2  | John             | 300   |    X    |
|  3  | Michael          | 270   |    X    |
|  4  | John             | 280   |    X    |
|  5  | Michael          | 256   |    Y    |
|  6  | Michael          | 230   |    Y    |
 ¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

So, I want to use a form to select the latest rows with different param but equal name.
For example, if I search for “Michael”, I want to use PHP to show the latest value for the param X and the latest value for the param Y (returning 2 rows).

Michael: Param Y: 230
Michael: Param X: 270

And if I search for “John” I get:

John: Param X: 280.

The code

    $sql = "SELECT * FROM thetable WHERE name = 'Michael' ORDER BY ID DESC";
    $result = mysql_query($sql);

Now I just want for it to select only the latest rows with different param.
Thanks in advance.

Answer 1

Are the approaches listed won’t work with n variable “params”. I think something similar may work:

SELECT
t.*
FROM Table1 t
JOIN
(SELECT 
           max(id) AS maxid
   FROM Table1
   GROUP BY name,param) x
on x.maxid = t.id
WHERE name='Michael'

See http://sqlfiddle.com/#!2/64dc4/11