MySQL加入查詢

Question

我遇到了MySQL連接查詢的問題 - 不幸的是我不太擅長連接。

Table page_section: 
------------------- 
id 
page_id 
name 
display_order 


Table page_section_sub: 
----------------------- 
id 
page_section_id 
page_id 
content 

一個page_section可以有很多page_section_sub

在我的網頁我想page_section.display_order

顯示來自page_section_sub行有序目前我有這樣的：

$query="SELECT * FROM page_section_sub WHERE page_section_id IN (1,2,3,4,5) 
ORDER BY display_order"; 

但這不是因爲缺少連接而工作。我該怎麼做呢？

Answer 1

select pss.* 
from page_section_sub pss 
inner join page_section ps on pss.page_section_id = ps.id 
where pss.page_section_id in (1, 2, 3, 4, 5) 
order by ps.display_order 

Answer 2

試試這個方法：

SELECT * FROM page_section 
LEFT JOIN page_section_sub ON page_section.page_id = page_section_sub.page_id 
WHERE page_section_id IN (1,2,3,4,5) 
ORDER BY display_order; 

Answer 3

試試這個：

Select page_section_id.* from page_section_id natural join page_section 
WHERE page_section_id IN (1,2,3,4,5) order by page_section_id.display_order