每当我尝试在phpMyAdmin中运行此MYSQL语句时,我都会收到此sytax错误:
1064 - 您的SQL语法出错;检查手册 对应于您的MySQL服务器版本,以便使用正确的语法 在第7行的“评论
,
last_comment, '%d/%m/%Y %H:%i:%s') AS
last_commentFROM
帖子附近”
代码:
"SELECT
`posts`.`post_id` AS `id`,
`posts`.`post_title` AS `title`,
LEFT(`posts`.`post_body`, 512) AS `preview`,
`posts`.`post_user` AS `user`,
DATE_FORMAT(`posts`.`post_date`,'%d/%m/%Y %H:%i:%s') AS `date`,
`comments`.`total_comments`,
DATE_FORMAT(`comments`.`last_comment`, '%d/%m/%Y %H:%i:%s') AS `last_comment`
FROM `posts`
LEFT JOIN (
SELECT
`post_id`,
COUNT(`comment_id`) AS `total_comments`,
MAX(`comment_date`) AS `last_comment`
FROM `comments`
GROUP BY `post_id`
) AS `comments`
ON `posts`.`post_id` = `comments`.`post_id`
ORDER BY `posts`.`post_date` DESC";
此外,所有表都正确命名。所以,这可以排除。
更新
太棒了,谢谢。我在评论中添加了引用,额外的周长是一段时间而不是逗号。
答案 0 :(得分:3)
答案 1 :(得分:1)
`comments`,`last_comment`
应该是
`comments`.`last_comment`
即。逗号应该是一个点,否则看起来你试图将三个参数传递给DATE_FORMAT。