mysql - SQL Group-By 最频繁

Question

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Answer 1

您可以使用相关子查询:

select distinct t1.PERSON, (
    select ATE
    from myTable t2
    where t2.PERSON = t1.PERSON
    group by ATE
    order by count(*) desc
    limit 1
) as ATE
from myTable t1

如果有联系，此查询将“随机”选择吃得最多的项目之一。

使用 MySQL 8 或 MariaDB 10.2(都还不稳定)您将能够使用 CTE(通用表表达式)

with t1 as (
    select PERSON, ATE, count(*) as cnt
    from myTable
    group by PERSON, ATE
), t2 as (
    select PERSON, max(cnt) as cnt
    from t1
    group by PERSON
)
    select *
    from t1
    natural join t2

在关系上，此查询可能会为每个组 (PERSON) 返回多行。