从触发器更新表
我在数据库中有以下表格:
CREATE TABLE `CRUISE-RES` (
`cruiseid` INT,
`end-day` DATE,
`start-day` DATE
PRIMARY KEY (`cruiseid`));
CREATE TABLE `ROOM` (
`cruise-id` INT,
`price` FLOAT,
FOREIGN KEY (`cruise-id`));
CREATE TABLE `PROFIT` (
`cruiseid` INT,
`total` FLOAT);
具有以下示例表插入:
-- cruise table inserts
insert into `CRUISE-ID` (`cruiseid`,`start-day`,`end-day`)
values (1, '2022/01/01', '2022/01/05'), (1, '2022/01/05', '2022/01/10'), (2, '2022/01/05', '2022/01/10')
-- room table inserts
insert into ROOM (price,`cruise-id`)
values (5,1), (10,1), (25,2)
我还具有以下功能,该功能根据每天的Cruise-Res *价格天数,显示每个Cruiseid的利润。
SELECT c.`cruiseid`, sum(rm.`price`*(DATEDIFF(c.`end-date`, c.`start-date`))) AS 'total_profit'
FROM ROOM rm
JOIN `CRUISE-RES` c
ON rm.`cruise-id` = c.cruiseid
GROUP BY rm.`cruise-id`,'cruiseid'
如何在每次插入巡航分区表之后更新利润表的触发器上使用此信息?
I have the following tables in a database:
CREATE TABLE `CRUISE-RES` (
`cruiseid` INT,
`end-day` DATE,
`start-day` DATE
PRIMARY KEY (`cruiseid`));
CREATE TABLE `ROOM` (
`cruise-id` INT,
`price` FLOAT,
FOREIGN KEY (`cruise-id`));
CREATE TABLE `PROFIT` (
`cruiseid` INT,
`total` FLOAT);
With the following sample table inserts:
-- cruise table inserts
insert into `CRUISE-ID` (`cruiseid`,`start-day`,`end-day`)
values (1, '2022/01/01', '2022/01/05'), (1, '2022/01/05', '2022/01/10'), (2, '2022/01/05', '2022/01/10')
-- room table inserts
insert into ROOM (price,`cruise-id`)
values (5,1), (10,1), (25,2)
I also have the following function that shows the profit of each cruiseid based on the number of days in the CRUISE-RES * price per day.
SELECT c.`cruiseid`, sum(rm.`price`*(DATEDIFF(c.`end-date`, c.`start-date`))) AS 'total_profit'
FROM ROOM rm
JOIN `CRUISE-RES` c
ON rm.`cruise-id` = c.cruiseid
GROUP BY rm.`cruise-id`,'cruiseid'
How can I use this information on a trigger that updates the PROFIT table after each insert into CRUISE-RES table?
如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。

绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱,如果其他用户或者作者回复了您的评论,将不能在第一时间通知您!
发布评论