[英]Nested select statement in mysql
您可以使用group_concat
函數:
SELECT message, GROUP_CONCAT(comment SEPARATOR ';') AS all_comments
FROM messages m
JOIN comments c ON m.id = c.message_id
GROUP BY m.id, message
您應該使用group_concat,對於group_concat,您需要分組依據
SELECT message, GROUP_CONCAT(comment SEPARATOR ';') as comments
FROM messages
JOIN comments ON messages .id = comments .message_id
GROUP By message
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.