如何INNER JOIN超過兩個類別？

Question

我在這里有點困惑，需要一些幫助...

情況是我已經制作了三個表（fr_Leagues，fr_nations和fr_confeds），我要做的就是添加一個聯賽，該聯賽顯示類別的名稱而不是帶有分頁的id。 這是代碼：

現在修復！

  "SELECT 
 a.id as confed_id,
 a.fr_short_name as confed_name, 
     b.id as nation_id,
 b.fr_name as nation_name,
 c.id as league_id,
 c.fr_name as league_name"
." FROM fr_confeds as a 
INNER JOIN fr_nations as b ON a.id = b.confed_id 
INNER JOIN fr_leagues as c ON b.id = c.nation_id"
." LIMIT $paginate->start, $paginate->limit"

Answer 1

您缺少如何將不同的表鏈接在一起的信息。 在每個INNER JOIN上，您都需要擁有它：

INNER JOIN fr_nations ON a.<someColumn> = b.<anotherColumn> INNER JOIN fr_leagues ON a.<someColumn> = b.<anotherColumn>

Answer 2

使用此查詢

SELECT * FROM fr_confeds為A

內聯接fr_nations為B ON A.id = B.confed_id

INNER JOIN fr_leagues作為C ON B.confed_id = C.league_id

LIMIT $ paginate->開始，$ paginate-> limit