标签:create 关联表 top class rmi 关联 left join ble apple
在使用update
语句的时候我们有时候需要利用left join
关联表,以下是正确操作:
效果,让指定的order
表id
为1,2,3数据的finish_at
字段更新为freports
表的created_at
字段
UPDATE orders
LEFT JOIN freports
ON freports.order_id = orders.id
set orders.finish_at = freports.created_at
where orders.id in(1,2,3)
mysql导出csv:
select * from table into outfile ‘/Users/k/Desktop/task.csv‘ fields terminated by ‘,‘;
csv导入mysql:
load data local infile ‘/Users/k/Desktop/task.csv‘ into table t_name
fields terminated by ‘,‘
(col1,col2,col3);
mysql update 的时候使用left join和where语句
标签:create 关联表 top class rmi 关联 left join ble apple
原文地址:https://www.cnblogs.com/0xcafedaddy/p/9010817.html