错误是带有连接和日期/时间间隔的查询

Question

我使用下面给出的查询从两个表中获取了记录。

mysql_query("SELECT Table1.username, SUM(Table2.points) 
AS total FROM Table2 INNER JOIN Table1 ON Table1.userid = Table2.userid 
GROUP BY Table1.username ORDER BY SUM(Table2.points) DESC LIMIT 10");

我正在尝试使用日期/时间限制[1天]第2个案例[7天]来获取相同的recrods。

mysql_query("SELECT Table1.username, SUM(Table2.points) 
AS total FROM Table2  WHERE  Table2.date BETWEEN (NOW() - INTERVAL 1 DAY) AND NOW() 
INNER JOIN Table1 ON Table1.userid = Table2.userid 
        GROUP BY Table1.username ORDER BY SUM(Table2.points) DESC LIMIT 10");

此查询无效，我无法找到此查询的问题。

表1没有任何日期colomn 表2包含一个我希望用于时间间隔的日期颜色。

我已经尝试了以下所有给出的队列。并为所有人收到同样的错误。

警告：mysql_fetch_array（）期望参数1是资源，布尔值在

中给出

补充：我在日期类型中使用时间戳。

请指导。

Answer 1

不仅在错误的地方看起来你应该使用CURDATE（）而不是NOW（），因为你说它是一个日期列而不是一个日期时间列

SELECT t1.username, SUM(t2.points) AS total 
FROM Table2 t2
JOIN Table1 t1 ON t1.userid = t2.userid  
WHERE t2.date BETWEEN (CURDATE() - INTERVAL 1 DAY) AND CURDATE()     
GROUP BY t1.username 
ORDER BY total DESC 
LIMIT 10;

注意： mysql _ * 已弃用，您不应该使用它...您应该使用参数化查询切换到PDO或mysqli。

了解参数化here as well as a good way to prevent sql injection incase you ever need to pass in variables

您的查询

SELECT Table1.username, SUM(Table2.points) AS total 
FROM Table2  
WHERE  Table2.date BETWEEN (NOW() - INTERVAL 1 DAY) AND NOW() 
^------------------------------------------------------------^ = bad this should be your JOIN first and then WHERE
INNER JOIN Table1 ON Table1.userid = Table2.userid 
GROUP BY Table1.username 
ORDER BY SUM(Table2.points) DESC LIMIT 10

我的查询

SELECT t1.username, SUM(t2.points) AS total 
FROM Table2 t2
JOIN Table1 t1 ON t1.userid = t2.userid  
WHERE t2.date BETWEEN (CURDATE() - INTERVAL 1 DAY) AND CURDATE()     
GROUP BY t1.username 
ORDER BY total DESC 
LIMIT 10;

注意WHERE在JOIN之后但在GROUP BY之前...

Answer 2

你好，因为应该在间隔上应用总和，使用而不是在哪里。

SELECT Table1.username, SUM(Table2.points) AS total 
  FROM Table2  
 INNER JOIN Table1 ON Table1.userid = Table2.userid 
 GROUP BY Table1.username 
 HAVING   Table2.date BETWEEN (NOW() - INTERVAL 1 DAY) AND NOW()
 ORDER BY SUM(Table2.points) DESC LIMIT 10