Mysql 操作日常記錄

1、刪除多餘的空記錄
delete from table where column1 is null and colunm2 is null;
2、group by函數的排序問題（求和與排序）
select sum(bian_page) bian_page,sum(shen_page) shen_page,sum(jiao_page) jiao_page ,name,xueduan,xueke,sum(day) day from table where xueduan=’{1}’ and status=’1’ and xueke=’{1}’ GROUP by name ORDER by bian_page DESC