mySQL将时间戳与当前日期进行比较

Question

I have a field in my table called created_at that is a time stamp. I am trying to write a query where is will give me data where the date in time stamp is the current date.

$result = mysql_query("SELECT *FROM visitors WHERE DATE(FROM_UNIXTIME(created_at)) = 
CURDATE()") or die(mysql_error());

I looked up how to get date from time stamp that is why I am using DATE(FROM_UNIXTIME(created_at)). My query is coming back with nothing found, but I do have created_at fields in my db that are todays date. What am I doing wrong?

Answer 1

The timestamp data type includes seconds so the times will never match. You need to trim the seconds from both the "created_at" timestamp and the current date/time (now()) before comparing so the you have a chance of matching just the date parts. For Example:

select * from visitors where DATE_FORMAT(created_at,'%Y%c%d')=DATE_FORMAT(now(),'%Y%c%d')