如何写多行父查询单行返回子查询子查询

Question

下面的查询会产生一些错误：

$sub = '(SELECT mulitple.* FROM timezoneabbreviation AS mulitple 
     WHERE single.gmtoffset = mulitple.gmtoffset) AS sametimezone'; 
$query = "SELECT $sub,single.* FROM timezoneabbreviation AS single 
     WHERE full_name='".$full_name."' "; 
return $this->db->query($query)->row(); 

我想写与在同一个表的子查询与WHERE条件主要查询的查询产生单行，但子查询产生多行。

Answer 1

只需使用JOIN

$query = "SELECT mulitple.*, single.* 
      FROM timezoneabbreviation AS single 
      INNER JOIN timezoneabbreviation AS mulitple 
       ON mulitple.gmtoffset = single.gmtoffset 
      WHERE single.full_name='".$full_name."'";