Question

这里有人帮助整理了这个非常有用的查询！

SELECT * FROM results r 
INNER JOIN categories c on r.id = c.result_id 
WHERE c.name in ('$purpose', '$prop_type', '$loan_type')
GROUP BY r.id
HAVING COUNT(c.c_id) = 3
LIMIT 50 OFFSET 0

哪个好极了！但是，当我尝试使用

命令结果时

SELECT * FROM results r 
INNER JOIN categories c on r.id = c.result_id 
WHERE c.name in ('$purpose', '$prop_type', '$loan_type')
ORDER BY r.usefulness DESC
GROUP BY r.id
HAVING COUNT(c.c_id) = 3
LIMIT 50 OFFSET 0

我收到语法错误。我错过了一些明显的东西吗？

非常感谢！

Answer 1

查询的各个部分有一个订单，ORDER BY应该在最后（LIMIT和OFFSET之前......试试这个：

SELECT * FROM results r 
INNER JOIN categories c on r.id = c.result_id 
WHERE c.name in ('$purpose', '$prop_type', '$loan_type')
GROUP BY r.id
HAVING COUNT(c.c_id) = 3
ORDER BY usefulness DESC
LIMIT 50 OFFSET 0

还要确保在任何行的末尾都有空格......

注意在mysql中LIMIT x OFFSET y的缩短版本 - 你可以写LIMIT y,x

Answer 2

ORDER BY必须在HAVING。

之后

ORDER BY破解mysql查询

2 个答案: