Mysql 按日期订购ASC在有日期的记录之前放置无日期的记录?
查询结果如下所示:Mysql 按日期订购ASC在有日期的记录之前放置无日期的记录?,mysql,sql,wordpress,Mysql,Sql,Wordpress,查询结果如下所示: 张贴A 职位B 邮递截止日期:8月2日 邮递截止日期:8月3日 邮递截止日期:8月4日 为什么没有\u due值的帖子总是先返回?我怎样才能让他们总是最后一个回来?如果我这样做: global $wpdb; $sql = "SELECT * FROM $wpdb->postmeta"; $sql .= " INNER JOIN $wpdb->posts ON $wpdb->postmeta.post_id = $wpdb->posts.ID"; $s
\u due
值的帖子总是先返回?我怎样才能让他们总是最后一个回来?如果我这样做:
global $wpdb;
$sql = "SELECT * FROM $wpdb->postmeta";
$sql .= " INNER JOIN $wpdb->posts ON $wpdb->postmeta.post_id = $wpdb->posts.ID";
$sql .= " WHERE $wpdb->posts.post_type = 'task'";
$sql .= " AND $wpdb->posts.post_parent IN ( SELECT `ID` FROM $wpdb->posts WHERE `post_type` = 'task_list' AND `post_parent` IN ( SELECT `ID` FROM $wpdb->posts WHERE `post_status` = 'publish' AND `post_type` = 'project' ) )";
$sql .= " AND $wpdb->postmeta.post_id IN ( SELECT `post_id` FROM $wpdb->postmeta WHERE $wpdb->postmeta.meta_key = '_completed' AND $wpdb->postmeta.meta_value = '0' )";
$sql .= " AND $wpdb->postmeta.post_id IN ( SELECT `post_id` FROM $wpdb->postmeta WHERE $wpdb->postmeta.meta_key = '_assigned' AND $wpdb->postmeta.meta_value = '%s' )";
$sql .= " AND $wpdb->postmeta.meta_key = '_due'";
$sql .= " GROUP BY $wpdb->posts.ID";
$sql .= " ORDER BY CAST( $wpdb->postmeta.meta_value AS DATE ) ASC, $wpdb->posts.ID ASC";
$tasks = $wpdb->get_results( sprintf( $sql, $user_id ) );
return $tasks;
没有\u到期
值的帖子被随机放置在具有\u到期
值的帖子之间
理想的结果应该是:
想法?您可以将函数isnull添加到order by子句中:
$sql .= " ORDER BY $wpdb->posts.ID ASC, CAST( $wpdb->postmeta.meta_value AS DATE ) ASC";
其中MAXDATE是比到期日值高的未来日期。那些没有到期日的被视为到期日为0,所以它们排在第一位。什么类型是
postETA.meta\u值
和无日期,你是指NULL
date吗?那么这是单独列中的“Post X.due”和“August2”吗在不同的栏目里?@Jodrell:是长文本。不,它不是NULL
而是empty
值。仅供参考,这是一个Wordpress架构。@AshReva:No.Post X
位于一个名为wp\u posts
的单独表中。在mysql中ISNULL是IFNULL
ORDER BY IFNULL(_due, MAXDATE)
ORDER BY IFNULL(_due, MAXDATE)
"ORDER BY CASE WHEN CAST( $wpdb->postmeta.meta_value AS DATE ) '' THEN 1 ELSE 0
END,CAST( $wpdb->postmeta.meta_value AS DATE )ASC, $wpdb->posts.ID ASC";