求一个 PostgreSQL 方法，取数组中出现频率最高的那个元素？ - V2EX

求一个 PostgreSQL 方法，取数组中出现频率最高的那个元素？ - V2EX

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这是一个创建于 1416 天前的主题，其中的信息可能已经有所发展或是发生改变。

比如数组：["A", "A", "B", "C"]

结果是： "A"，如果并列则取第一个就行。

3 条回复

1

jindeq

2021-11-25 16:13:16 +08:00

没有直接的方法，你可以定义一个方法在 postgres 中。每次查询去调用。

2

MoYi123

2021-11-25 18:05:50 +08:00

https://stackoverflow.com/questions/63358997/postgresql-get-the-most-common-value-in-array

3

beginor

2021-11-25 19:09:14 +08:00 via Android

1

记得 pg 有个函数可以将数组转成记录，然后再 groupby + count 就很容易了

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