MySQL右連接兩張表

Question

我有三張表：醫院，檢查和問題。醫院可以有零或更多的檢查。檢查可能有零個或多個問題。我需要得到一張表格，其中包含與醫院有關的所有違規行爲以及日期。表看起來像：

Business Table b 
---------------------------- 
|id|name|address|city|state| 

Inspection Table i 
--------------------- 
|id|business_id|date| 

Issue Table v 
----------------------------------- 
|id|business_id|inspection_id|desc| 

我需要什麼，由i.date desc命令是：

Query result 
-------------------------------- 
|b.name|b.address|i.date|v.desc| 

會有每檢查一個以上的問題，所以我需要一排具有與上述相同。這就是我所得到的結果，但即使在不同的日期觀察到最新的檢查數據，也會爲每個問題返回。

以下是我爲我的查詢：

SELECT b.business_name AS Name, b.address, b.city, b.state, i.date, v.desc 
FROM business_table AS b 
RIGHT JOIN inspection_table i ON i.business_id = b.id 
RIGHT JOIN issue_table v ON v.inspection_id = i.id 
ORDER BY i.date DESC 

Answer 1

試試這個

SELECT b.business_name AS Name, b.address, b.city, b.state, i.date, v.desc 
FROM issue_table v 
LEFT JOIN inspection_table i ON i.id = v.inspection_id 
LEFT JOIN business_table AS b ON v.business_id = b.id 
ORDER BY v.business_id, i.date DESC