如何兩位內線/分類表MYSQL SELECT查詢組合成一個

Question

我有兩個MySQL查詢：

1) "SELECT ID,post_title,post_category,post_perma FROM ".TBL_POSTS." 
    WHERE published='1' AND page='0' ORDER BY ID DESC LIMIT 10" 

2) "SELECT p.cat_ID,p.cat_nicename FROM ".TBL_CATEGORIES." n, ".TBL_CATEGORIES." p 
    WHERE n.lft BETWEEN p.lft AND p.rgt AND n.cat_ID='".post_category."' ORDER BY p.lft 

首先查詢選擇職位，然後通過post_category秒選擇類別的路徑，請注意，post_category會從第一個查詢取指post_category在兩個表共同..第一表格它被命名爲post_category和第二它是cat_ID

現在我在foreach循環這是不好的運行它。另外有一點要注意的是第二個查詢也將返回數組和一個數組應該對應post_category

任何SQL高手可以幫我嗎？

許多感謝名單

Answer 1

我會用LEFT JOIN

像這樣：

$sql = "SELECT `p`.`ID`,`p`.`post_title`,`p`.`post_category`,`p`.`post_perma`,`c`.`cat_ID`,`c`.`cat_nicename` FROM `".TBL_POSTS."` AS `p` "; 
$sql .= "LEFT JOIN `".TBL_CATEGORIES."` AS `c` ON `c`.`cat_ID`=`p`.`post_category` WHERE `p`.`published`='1' AND `p`.`page`='0' ORDER BY `p`.`ID` DESC LIMIT 10"; 

您可能需要調整WHERE條款適合您的需求更多......

請注意：這是一個字符串，我剛剛將它們分成兩行，因此它更易於閱讀。 .=是追加當前字符串。

Answer 2

請試試這個，它可能對您有所幫助。

SELECT a.ID, a.post_title,a.post_category,a.post_perma, b.cat_ID, b.cat_nickname 
FROM (SELECT ID,post_title,post_category,post_perma FROM ".TBL_POSTS." WHERE published='1' AND page='0' ORDER BY ID DESC LIMIT 10) a 
LEFT JOIN (SELECT p.cat_ID as cat_ID,p.cat_nicename as cat_nickname FROM " . TBL_CATEGORIES . " n, " . TBL_CATEGORIES . " p WHERE n.lft BETWEEN p.lft AND p.rgt AND n.cat_ID = '" .$post_category. "' ORDER BY p.lft) b ON a.ID = b.cat_ID