mySQL将时间戳与当前日期进行比较

问题描述：

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?

我的表中有一个名为created_at的字段，它是一个时间戳。我正在尝试编写一个查询，其中将给出数据，其中时间戳中的日期是当前日期。 p>

  $ result = mysql_query（“SELECT * FROM visitor WHERE DATE（FROM_UNIXTIME（created_at））= 
 {nCURDATE（）”）或die（mysql_error（））; 
   pre> 
 
 我查找了如何从时间戳中获取日期，这就是我使用DATE（FROM_UNIXTIME（created_at））的原因。
我的查询返回时未找到任何内容，但是 我的db中的created_at字段是今天的日期。 我做错了什么？ p> 
  div>

答

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')

mySQL将时间戳与当前日期进行比较

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