Question

我试图在一个查询中使用两个JOIN语句，

$sqlsorgu = mysql_query("SELECT *, COUNT(*), AVG(clicks), AVG(scrolls), AVG(spent)
FROM track where referid='".$memberr."' GROUP BY referer ORDER BY id desc limit 15 
JOIN
(
   select id, country, num, num*100/total pct 
   from (SELECT id,country, count(*) as num 
   FROM track GROUP BY country 
   ORDER BY num desc limit 5) x 
   join (select count(*) total from track) y
) tc on t.id = tc.id") or die(mysql_error());

但是我收到了这个错误：

您的SQL语法有错误;查看与您的MySQL服务器版本对应的手册，以便在'JOIN附近使用正确的语法（从第1行的SELECT SELECT，country'中选择id，country，num，num * 100 / total pct

使用它的正确方法是什么？

Answer 1

GROUP BY / WHERE /在加入声明之后命令。尝试录制如下：

"SELECT *, COUNT(*), AVG(clicks), AVG(scrolls), AVG(spent)
FROM track t
JOIN
(
   select id, country, num, num*100/total pct 
   from (SELECT id,country, count(*) as num 
   FROM track GROUP BY country 
   ORDER BY num desc limit 5) x 
   join (select count(*) total from track) y
) tc on t.id = tc.id
where referid='".$memberr."' 
GROUP BY referer 
ORDER BY tc.id desc limit 15

mySQL - 在一个查询中使用两个JOIN？

1 个答案: