Question

All,

I need your help to merge the result in the same datetime in mysql.

I do a query of two tables like :

SELECT b.ID, b.DateTime, b.Value 
FROM tableA a, tableB b 
WHERE (a.Id=1) OR (a.Id=2) OR (a.Id=3) AND (a.Id = b.ID) 
      AND (b.DateTime Between '2011-04-02 06:00' And '2011-04-02 06:05')

Query result :

| ID  |    DateTime      | Value |
----------------------------------
| 1   | 2011-04-02 06:00 | 20    | 
| 1   | 2011-04-02 06:05 | 21    | 
| 2   | 2011-04-02 06:00 | 10    | 
| 2   | 2011-04-02 06:05 | 16    | 
| 3   | 2011-04-02 06:00 | 23    | 
| 3   | 2011-04-02 06:05 | 22    |

All i want is to make a result like :

|    DateTime      | ID_1    | ID_2   | ID_3   | 
------------------------------------------------
| 2011-04-02 06:00 |  20     |   10   | 23     | 
| 2011-04-02 06:05 |  21     |   16   | 22     | 

I hope there is a solution for this.

Thank you before for all your help.

Regards,
YougyZ

Answer 1

Thanks @liquorvicar for the solution…

I have tried this query :

SELECT b.Date, 
SUM(CASE WHEN a.Id=1 THEN b.Value ELSE 0 END) AS Mac1, 
SUM(CASE WHEN a.Id=2 THEN b.Value ELSE 0 END) AS Mac2, 
SUM(CASE WHEN a.Id=3 THEN b.Value ELSE 0 END) AS Mac3 
FROM TableA a, TableB b 
WHERE (a.Id = b.ID) AND (b.Date Between '2011-04-02 06:00' And '2011-04-02 06:05') 
GROUP BY b.DA_Date 

The Result is just like what i need.. 🙂