當我執行以下查詢時;我想從三個表中的一個表內的第一個表中的一個表內部連接限制1
SELECT wp_posts.ID,wp_posts.post_title, wp_posts.post_date,wp_users.display_name
FROM wp_posts
INNER JOIN wp_users ON wp_posts.post_author=wp_users.ID
INNER JOIN wp_comments ON wp_comments.comment_post_ID=wp_posts.ID
INNER JOIN (
SELECT comment_author,comment_date,comment_content
FROM wp_comments
ORDER BY comment_date DESC LIMIT 1) b ON b.comment_post_ID=wp_posts.ID
WHERE wp_posts.post_type='app-forum'
ORDER BY wp_posts.post_date DESC
我得到這個錯誤
#1054 - Unknown column 'b.comment_post_ID' in 'on clause'
你有'SELECT COMMENT_AUTHOR選擇'comment_post_ID', COMMENT_DATE, COMMENT_CONTENT FROM wp_comments ORDER BY comment_date DESC LIMIT 1' –
考慮提供適當的創建和插入語句以及期望的結果 – Strawberry