Question

我在hackerrank上做了一个sql oj。我需要先命名具有相应计数的名称和订单职业的人。数据库表，如png图像显示table structure。我想用

.tooltip-subtitle {
    color: #EEEEEE;
    max-width: 350px;
    word-wrap: break-word;
    font-style: italic;
    font-size: 13px;
    text-align: justify;
}

解决这个问题，但得到“[Err] 1111 - 无效使用群组功能”。如果我按计数（职业）评论顺序可能没问题。或者只是使用

select type from
(
(
SELECT name as type, 1 as filter FROM occupations
order by name
)
UNION All
(
select concat(count(occupation), ' ', lower(occupation), 's.') as type, 2 as filter
FROM occupations
group by occupation 
order by count(occupation)
)
) result
order by filter, type

也没关系，但一旦工会收到此错误

select concat(count(occupation), ' ', lower(occupation), 's.') as type, 2 as filter
FROM occupations
group by occupation 
order by count(occupation)

但我将此联合复制到postgresql（更改字符串合约函数）没关系，没有此错误。postgresql is okay 在mysql中，我必须将此“按次数排序（占用）”设置为另一个临时表来解决此错误，如下所示：

(
SELECT name as type, 1 as filter FROM occupations
order by name
)
UNION All

(
select concat(count(occupation), ' ', lower(occupation), 's.') as type, 2 as filter
FROM occupations
group by occupation 
order by count(occupation)
)

我很困惑，非常感谢你的帮助！

Answer 1

order by在工会中无效。将order by移到联合操作之外。

UNION显示时的mysql [Err] 1111 - 无效使用组功能

1 个答案: