首页 \ 问答 \ Mysql数据库...主键和外键[重复](Mysql Database… Primary key and Foreign keys [duplicate])

Mysql数据库...主键和外键[重复](Mysql Database… Primary key and Foreign keys [duplicate])

这个问题在这里已有答案:

我是mysql数据库的新手,所以我很抱歉,如果这是一个noob问题...如果我有2个数据库,数据库a和数据库b ..然后我在每个数据库中创建了1个表..我可以使用表在数据库b中连接到数据库a中的表有一个外键和主键? 或者它只能连接在同一个数据库的表之间?


This question already has an answer here:

I'm kinda new at mysql database so I'm sorry if this is kinda noob question... if I have 2 database, database a and database b.. then I created 1 table in each database.. can I use the table in database b to connect to the table in database a to have a foreign and primary key? or it can only be connected between tables on the same database?


原文:https://stackoverflow.com/questions/16876371
更新时间:2021-01-09 11:01

最满意答案

返回true允许表单提交。 将其从单击更改为提交事件处理程序并始终返回false,这将阻止表单提交。 我假设页面正在重新加载,这就是为什么你没有看到你的div。


Returning true allows the form to submit. Change it from click to submit for the event handler and always return false which will prevent for form from submitting. I assume the page is reloading which is why you aren't seeing your div.

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