[英]Postgres query to combine multiple rows with same value of a column into a single row
[英]From multiple rows to single column in Postgres
我正在通过具有只读访问权限的pgAdmin 4使用Postgres 9.5,我正在尝试编写一个select查询,该查询将从这种形式转换数据:
+----------+-------------------+--------------------+----------------+
| username | filters | groups | roles |
+----------+-------------------+--------------------+----------------+
| kd24 | Khaled <27607> | V1 | NewsStand User |
| kd24 | Khaled <27607> | V1 | User |
| kd24 | Khaled <27607> | Weekly KPIs | NewsStand User |
| kd24 | Khaled <27607> | Detailed Sales | User |
| kd24 | Khaled <27607> | Qanz Monthly Group | User |
| kd24 | Khaled <27607> | Detailed Sales | NewsStand User |
| kd24 | Khaled <27607> | Qanz Monthly Group | NewsStand User |
| kd24 | Khaled <27607> | Weekly KPIs | User |
| kd24 | Khaled <F_27607> | Weekly KPIs | User |
| kd24 | Khaled <F_27607> | Weekly KPIs | NewsStand User |
| kd24 | Khaled <F_27607> | Qanz Monthly Group | NewsStand User |
| kd24 | Khaled <F_27607> | Detailed Sales | User |
| kd24 | Khaled <F_27607> | V1 | User |
| kd24 | Khaled <F_27607> | Detailed Sales | NewsStand User |
| kd24 | Khaled <F_27607> | Qanz Monthly Group | User |
| kd24 | Khaled <F_27607> | V1 | NewsStand User |
| kd24 | khaled.d | Weekly KPIs | User |
| kd24 | khaled.d | V1 | NewsStand User |
| kd24 | khaled.d | Detailed Sales | NewsStand User |
| kd24 | khaled.d | Qanz Monthly Group | NewsStand User |
| kd24 | khaled.d | Weekly KPIs | NewsStand User |
| kd24 | khaled.d | V1 | User |
| kd24 | khaled.d | Detailed Sales | User |
| kd24 | khaled.d | Qanz Monthly Group | User |
+----------+-------------------+--------------------+----------------+
填写此表格:
+----------+-----------------------------------------------+-----------------------------------------------------+---------------------+
| username | filters | groups | roles |
+----------+-----------------------------------------------+-----------------------------------------------------+---------------------+
| kd24 | Khaled <27607>, Khaled <F_27607>,khaled.d | V1, Weekly KPIs, Detailed Sales, Qanz Monthly Group | NewStand User, User |
+----------+-----------------------------------------------+-----------------------------------------------------+---------------------+
注意列过滤器,组和角色中的值可能会更改。
是一个可以执行该操作的postgres选择脚本?
非常感激!
您可以使用与诸如array_agg之类的聚合函数一起使用distinct
关键字,以从每一列中收集不同的值:
select
array_agg(distinct username) as username,
array_agg(distinct filters) as filters,
array_agg(distinct groups) as groups,
array_agg(distinct roles) as groups
from YourTable;
尝试这个
SELECT
username,
string_agg(DISTINCT filters,',') as filters,
string_agg(DISTINCT groups,',') as roles,
string_agg(DISTINCT roles,',') as groups
FROM
table1
GROUP BY
username;
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