我在数据库中有一个字段名称session_dayofweek,它存储日期名称,例如'Mon'。我想获取session_dayofweek排序的记录。从星期日开始,记录应该像Sun,Mon,Tue等一样排序。我在wordpress数据库上运行查询。
这是我的问题:
$wpdb->pre_assignments = $wpdb->prefix . 'tc_pre_assignments';
$get_session_name=$wpdb->get_results("SELECT $wpdb->pre_assignments.*,$wpdb->sessions.* FROM $wpdb->pre_assignments JOIN $wpdb->sessions on $wpdb->pre_assignments.session_id = $wpdb->sessions.session_id WHERE $wpdb->sessions.session_id='".$session_id."'");
请帮帮我。提前谢谢。
答案 0 :(得分:1)
您可以按
使用条件订单ORDER BY CASE
WHEN session_dayofweek = 'Sun' THEN 1
WHEN session_dayofweek = 'Mon' THEN 2
WHEN session_dayofweek = 'Tue' THEN 3
WHEN session_dayofweek = 'Wed' THEN 4
WHEN session_dayofweek = 'Thu' THEN 5
WHEN session_dayofweek = 'Fri' THEN 6
WHEN session_dayofweek = 'Sat' THEN 7
ELSE 8
END
如果你正在寻找一种模式排序(又名sun,mon,tue,wed,thu,fri,sat,sun,mon,tue等)你可以做这样的事情
ORDER BY assignment_id, FIELD(session_dayofweek,'Sun','Mon','Tue','Wed','Thu','Fri','Sat')