MySQL查詢;選擇加入的多個數據的數據

Question

我有兩個表格，我想要獲取所有（後）記錄，其中的語言是英語，捐款金額高於25歐元。

這是查詢構造;

SELECT wp_posts.* , wp_postmeta.* 
FROM wp_posts 
JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id 
WHERE (wp_postmeta.meta_key = 'lang_code' AND wp_postmeta.meta_value = 'en') 
AND (wp_postmeta.meta_key = 'donated' AND CAST(wp_postmeta.meta_value AS SIGNED) > '25') 
AND wp_posts.post_type = 'donation' 
AND wp_posts.post_status = 'publish' 
ORDER BY wp_posts.post_date DESC 
LIMIT 1 OFFSET 0; 

表＃1（wp_posts）

--------------------------------------------------- 
ID | name   | post_type | post_status 
--------------------------------------------------- 
01 | test entry 1 | donation | publish 
02 | test entry 2 | donation | publish 
03 | test entry 3 | donation | awaiting 

表＃2（wp_postmeta）;

--------------------------------------------------- 
meta_id | post_id | meta_key | meta_value 
--------------------------------------------------- 
23  | 01  | lang_code | en 
84  | 01  | donated | 3100 
25  | 02  | lang_code | en 
63  | 02  | donated | 15 

該演示數據的預期結果;

--------------------------------------------------- 
ID | name   | post_type | post_status 
--------------------------------------------------- 
01 | test entry 1 | donation | publish 

我怎樣才能得到我需要的結果，沒有子查詢？

Answer 1

爲此，您可以使用兩個連接：

SELECT p.* , pml.*, pmd.* -- although you probably only want the value column 
FROM wp_posts p JOIN 
    wp_postmeta pml 
    ON p.ID = pml.post_id AND 
     pml.meta_key = 'lang_code' AND 
     pml.meta_value = 'en' JOIN 
    wp_postmeta pmd 
    ON p.ID = pmd.post_id AND 
     pmd.meta_key = 'donated' AND CAST(pmd.meta_value AS SIGNED) > 25 WHERE p.post_type = 'donation' AND p.post_status = 'publish' 
ORDER BY p.post_date DESC 
LIMIT 1 OFFSET 0;