PostgreSQL选择行（结果）作为数组 [英] Postgresql select rows(a result) as array

问题描述

假设我有下表以及一些数据。

Assume I have following table, plus some data.

create table "common"."log"("id" bigserial primary key, 
                            "level" int not null default 0);

现在，我有了这个选择查询，它将返回类似这样的内容。

select * from common.log，其中id = 147;

Now I have this select query that would return something like this.
select * from common.log where id=147;

+------+--------+
|id    |level   |
+------+--------+
|147   |1       |
|147   |2       |
|147   |2       |
|147   |6       |
|147   |90      |
+------+--------+

现在，我希望有类似以下内容的提示

Now I like to have something like following rather above

+------+---------------+
|id    |arr_level      |
+------+---------------+
|147   |{1,2,2,6,90}   |
+------+---------------+

那么有没有隐式的select子句/方式来做到这一点？谢谢。



pgsql v9.3

So is there any implicit select clause/way for doing this? thanks.

pgsql v9.3

推荐答案

您可以像这样使用用户数组功能

You can user array function like this

 Select '147' as id,array(select level from common.log where id=147) as arr_level;

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