MySQL 中的 INSERT 和 UPDATE 有什么区别?
似乎INSERT
和UPDATE
对我做了同样的事情.
It seems INSERT
and UPDATE
do the same things to me.
在某些情况下我应该使用 INSERT
而不是 UPDATE
,反之亦然?
Is there any occasions where I should use INSERT
instead of UPDATE
and vice versa?
推荐答案
在 CRUD 操作,INSERT
是C",UPDATE
是U".它们是持久存储的四个基本功能中的两个.另外两个是SELECT
和DELETE
.没有这四个操作,一个典型的数据库系统就不能算是完整的.
In CRUD operations, the INSERT
is the 'C' and the UPDATE
is the 'U'. They are two of the four basic functions of persistent storage. The other two are SELECT
and DELETE
. Without at least these four operations, a typical database system cannot be considered complete.
使用 INSERT
插入新记录.
使用 UPDATE
更新现有记录.
Use UPDATE
to update an existing record.
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