MySQL 5.6 InnoDB count、group by、having 和 order by 返回错误结果

Question

我遇到了一个大查询的问题，但试图简化它并发现了类似的奇怪行为:

select concat(a.col1,a.col2) as b,
       count(a.id) as c
from test as a
group by a.id
having b = "644591"
order by b

相同的查询在 5.6 InnoDB 上不返回任何结果，但 5.5 MyISAM 返回一个正确的匹配项。

如果您删除“order by b”，它也会在 InnoDB 上返回正确的结果。

表格:

CREATE TABLE `test` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `col1` varchar(100) NOT NULL DEFAULT '',
  `col2` varchar(100) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB

id|col1    |col2
 1|        |644591
 2|70083531|1226109

Answer 1

怎么样...

select concat(a.col1,a.col2) as b,
       count(a.id) as c
from test a
where concat(a.col1,a.col2) = '644591'
group by concat(a.col1,a.col2)
order by b;