如何将请求的 SELECT 中的 PostgreSQL 数据透视表字段 (foo_id) 替换为其从 foo 表中获取的值？

Question

Below is my current request made in the foo_bar pivot table:

SELECT
    foo_id AS foo,
    COUNT(foo_id) AS total
FROM foo_bar
GROUP BY foo_id

How to replace the value of foo_id in the SELECT by foo.name taken from foo table ?

Answer 1

You need to join the table foo , assuming both have a foo_id to join the tables:

SELECT
    f.name,
    COUNT(fb.foo_id) AS total
FROM foo_bar fb
JOIN foo f
   ON f.foo_id = fb.foo_id
GROUP BY f.name