加入基於參數

Question

我有兩個查詢，查詢同一個表，但基於不同的參數兩個MySQL查詢，

然後我需要玉米粥這兩個結果集在一起基於certian參數

//get initial text 
Q1 
SELECT 
campaign_id AS campaign_id, 
from_number AS mobile, 
received_msg AS join_txt, 
date_received AS join_txt_date 
FROM received_txts WHERE action_id = 4 AND msg_link_id = id; 

//get final text 
Q2 
SELECT 
campaign_id AS campaign_id, 
from_number AS mobile, 
received_msg AS final_txt, 
date_received AS final_txt_date 
FROM received_txts WHERE action_id = 4 AND msg_complete_id = id; 

/join these two queries on 
Q2.msg_link_id = Q1.id AND Q2.campaign_id = Q1.campaign_id AND Q2.from_number = Q1.from_number 

Answer 1

SELECT 
    Q1.campaign_id AS campaign_id, 
    Q1.from_number AS mobile, 
    Q1.received_msg AS join_txt, 
    Q1.date_received AS join_txt_date, 
    Q2.received_msg AS final_txt, 
    Q2.date_received AS final_txt_date 
FROM received_txts Q1 JOIN received_txts Q2 
    ON Q2.msg_link_id = Q1.id 
    AND Q2.campaign_id = Q1.campaign_id 
    AND Q2.from_number = Q1.from_number 
WHERE Q1.action_id = 4 
    AND Q2.action_id = 4 
    AND Q1.msg_link_id = Q2.id 
    AND Q2.msg_complete_id = Q2.id 

Answer 2

使用虛擬表：

SELECT * 
FROM table AS t1 
JOIN (select ..) AS t2 
ON (t1.foo = t2.foo)