Question

我有一个select语句输出：

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * @ORM\Entity
 * @ORM\Table(name="brands")
 */
class Brands
{
/**
 * @var integer
 * 
 * @ORM\Id
 * @ORM\Column(type="smallint",length=3,unique=true,options={"unsigned":true})
 * @ORM\GeneratedValue(strategy="AUTO")
 */
protected $id;

/**
 * one brands has many models
 * 
 * @ORM\OneToMany(targetEntity="Models", mappedBy="brandId")
 */
private $models;

public function __construct()
{
    $this->models = new ArrayCollection();
}

/**
 * @ORM\Column(type="string", length=25)
 */
private $brand;
.......
}

这些值表示每个客户注册的总天数。在这个例子中，我使用了4条记录，所以要获得平均值，我需要做（（991 + 127 + 664 + 889）/ 4）。

如何在SQL中实现这样的功能？

Answer 1

 
 
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Answer 2

使用以下查询，

SELECT (SUM(TOTAL_DAYS)/4) FROM TABLE_NAME;

简单的SQL平均值

2 个答案: