Question

I need to write a query to retrieve values from two columns using mysql table

My table has the following strucutre

| ID |  user_id   |        datetime     |        message     | 
| 1  |     21     | 2012-05-10 04:13:01 |        message1    |  
| 2  |     07     | 2012-05-10 04:17:51 |        message2    |  
| 3  |     21     | 2012-05-11 04:21:51 |        message3    | 
| 4  |     21     | 2012-05-11 04:43:51 |        message4    | 
| 5  |     07     | 2012-05-11 04:21:51 |        message5    | 
| 5  |     21     | 2012-05-11 04:43:51 |        message6    | 

i wrote the below query

$query=”SELECT MAX(datetime) FROM messages where user_id=21 and date=2012-05-11″;

but i am not getting latest record from table iam getting null value

help us

Answer 1

$query="SELECT MAX(datetime) FROM messages where user_id=21 and date LIKE '2012-05-11%'";