Mysql如何实现在插入数据时更新其中一个字段？
我的sql语句如图，如何在insert的时候更新其中的project_id字段呢?
回复内容：
我的sql语句如图，如何在insert的时候更新其中的project_id字段呢?
直接给你个例子，相信你能看懂，insert into users (id,username,password) select null,username,'3333' from users where id=1
ON DUPLICATE KEY UPDATE 语法，这个要配合唯一索引使用
先插入insert 如果成功则 返回自增ID,再执行update 这样可以啊,执行2条SQL就行
这是要写触发器么。。。
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