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选择查询来转换来自这种形式的数据:
+----------+-------------------+--------------------+----------------+
| 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 |
+----------+-------------------+--------------------+----------------+
到这个表格:
+----------+-----------------------------------------------+-----------------------------------------------------+---------------------+
| username | filters | groups | roles |
+----------+-----------------------------------------------+-----------------------------------------------------+---------------------+
| kd24 | Khaled <27607>, Khaled <F_27607>,khaled.d | V1, Weekly KPIs, Detailed Sales, Qanz Monthly Group | NewStand User, User |
+----------+-----------------------------------------------+-----------------------------------------------------+---------------------+
请注意列过滤器、组和角色中的值可能会更改。
是否有可以执行该操作的 postgres 选择脚本？
非常感谢!
最佳答案
试试这个
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;
关于sql - 在 Postgres 中从多行到单列，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51249508/