Postgres：如何将列组合到同一行值

Question

如何组合多个可以放入同一行的列而不是多次显示相同的行？

goto

分为：

flight               | Manager   | Lead  | Worker
---------------------|-----------|-------|--------
Arizona_BGS_Flight_2 | John      |       |
Arizona_BGS_Flight_2 |           | Will  |
Arizona_BGS_Flight_2 |           |       | James
Utah_UTS_Flight_5    | John      |       |

Answer 1

您可以使用聚合：

select flight, max(manager) as manager, max(lead) as lead, max(worker) as worker
from t
group by flight;