Question

我在使用Order By执行SQL时遇到问题。问题是，如果我在做Order By，需要很长时间，我的服务器上有一个峰值。如果有任何方法可以通过

获取没有订单的最大值

具有排序依据的代码示例：

SELECT DISTINCT TOP 3 s.title, s.imageUrl, count(sv.saleid) as mostViewPeriod14Days, s.guid 
FROM dbo.Sales s 
INNER JOIN dbo.KEY_BrandcategoryToSale b_key ON s.id = b_key.saleId 
INNER JOIN dbo.SaleView sv ON s.id = sv.saleId 
WHERE (sv.date <= GETDATE()) 
AND (sv.date >= GETDATE() - 14) 
AND s.isActive = 1 AND s.isHotsale = 1 
AND b_key.brandCategoryId = 28 AND s.id NOT IN (SELECT sv.saleId FROM dbo.SaleView sv WHERE sv.userId = 99114) 
GROUP BY s.title, s.imageUrl, s.guid 
ORDER BY mostViewPeriod14Days Desc

我的工作是什么，但没有订单：

SELECT DISTINCT TOP 3 s.title, s.imageUrl, count(sv.saleid) as mostViewPeriod14Days, s.guid 
    FROM dbo.Sales s 
    INNER JOIN dbo.KEY_BrandcategoryToSale b_key ON s.id = b_key.saleId 
    INNER JOIN dbo.SaleView sv ON s.id = sv.saleId 
    WHERE (sv.date <= GETDATE()) 
    AND (sv.date >= GETDATE() - 14) 
    AND s.isActive = 1 AND s.isHotsale = 1 
    AND b_key.brandCategoryId = 28 AND s.id NOT IN (SELECT sv.saleId FROM dbo.SaleView sv WHERE sv.userId = 99114) 
    GROUP BY s.title, s.imageUrl, s.guid

Answer 1

尝试以下查询，如果有帮助请告诉我。以下几点概述

包含计算日期的WHERE子句比不包含计算日期的子句慢。

如果可以避免，请不要在查询中添加“子选择”。将其更改为左连接并检查空记录（更快）

var name = $("input#name").val();
var email = $("input#email").val(); 
var telephone = $("input#telephone").val();
var message = $("textarea#message").val(); 

var dataString = 'name='+ name + '&email=' + email + '&phone=' + phone + '&message=' + message;  

$.ajax({  
  type: "POST",  
  url: "process.php",  
  data: dataString,  
}  
});

MS SQL Order By要长时间执行

1 个答案: