mysql知识点汇集

1、将两个表字段类型一致的数据合并到一个新表的命令。

INSERT into new_table(user_name,password,age) SELECT user_name,password,age FROM old_table1;

INSERT into new_table(user_name,password,age) SELECT user_name,password,age FROM old_table2;

2、对每一天的数据进行统计，并输出到一个excel文件中。

select * from (select
    DATE_FORMAT(e.create_Time,'%Y年%m月%d日') as time,
    sum( e.actionorder_number) as '激活数',
    sum( e.neworder_number) as '新增数',
    sum( e.unsub_number ) as '退订数'

from extract_order_info e
WHERE
     e.create_Time BETWEEN '2018-10-01' and '2018-10-25'
GROUP BY time
ORDER BY time) f INTO OUTFILE "D:\1.xls"