加入三個不同的mysql查詢表

Question

Hai我是php和mysql的新手。這裏想要加入三個不同的要求。 這裏是我的查詢

查詢1：

SELECT u.user_name,u.first_name 
FROM users u join users_cstm uc on u.id=uc.id_c 
WHERE u.deleted=0? 

QUERY2：

SELECT l.assigned_user_id,count(*) AS lead_count 
FROM lead l GROUP BY l.assigned_user_id? 

QUERY3：

SELECT l.assigned_user_id,AVG(DATEDIFF(l.date_modified,l.date_entered)) AS avgdays 
FROM leads l GROUP BY l.assigned_user_id? 

和so..on ..

這是我期待的結果for user_name，first_name，lead_count，avgdays。從三張桌子。

BigQuery join of three tables

我試圖從上面的鏈接我的解決方案。但是我沒有得到結果？

謝謝你的幫助和建議。

Answer 1

試試下面的查詢： -

SELECT u.user_name,u.first_name, 
lead_table.lead_count,lead_table.avgdays 
FROM users u join users_cstm uc on u.id=uc.id_c 
left join 
(SELECT l.assigned_user_id, 
     AVG(l.date_modified) AS avgdays, 
     count(*) AS lead_count 
FROM leads l GROUP BY l.assigned_user_id) lead_table 
on u.id=lead_table.assigned_user_id 
WHERE u.deleted=0; 

Answer 2

試試這個：

SELECT id,user_name,first_name,lead_count,avgdays from 
(SELECT id,user_name,first_name,lead_count from 
(SELECT u.id,u.user_name,u.first_name FROM users u,users_cstm uc where u.id=uc.id_c and u.deleted=0) as a 

LEFT JOIN 

(SELECT l.assigned_user_id,count(*) AS lead_count FROM lead l GROUP BY l.assigned_user_id) as b 
on a.id = b.assigned_user_id) as a 

LEFT JOIN 

(SELECT l.assigned_user_id,AVG(DATEDIFF(l.date_modified,l.date_entered)) AS avgdays 
FROM leads l GROUP BY l.assigned_user_id) as b 
on a.id = b.assigned_user_id