0
job
id job_name
1 php
2 python
3 ROR
applied_user
id job_id user_id
1 2 4
2 2 5
3 2 5
4 1 54
現在我想看看有多少就業機會,單查詢
jobs applied_user
3 4
job
id job_name
1 php
2 python
3 ROR
applied_user
id job_id user_id
1 2 4
2 2 5
3 2 5
4 1 54
現在我想看看有多少就業機會,單查詢
jobs applied_user
3 4
應用於成員這將顯示你獨特的工作#和適用的獨特用戶數量
SELECT
COUNT(DISTINCT job_id) as jobs,
COUNT(DISTINCT user_id) as applied_user
FROM
applied_user