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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                [https://www.cnblogs.com/HLBBLOG/p/14271728.html](https://www.cnblogs.com/HLBBLOG/p/14271728.html) [https://www.cnblogs.com/HLBBLOG/p/14248912.html](https://www.cnblogs.com/HLBBLOG/p/14248912.html) ~~~sql create database +數據庫名; ~~~ ~~~sql create table test(id int,name varchar(32)); ~~~ 只復制表結構和數據,但是不復制相關約束 ~~~sql create table test2 as select * from test1; ~~~ 只復制表結構及約束,但不復制數據 ~~~sql create table test2 like test1; ~~~ 修改表明 ~~~sql alter table test1 rename test2; ~~~ 2.添加字段 ~~~sql alter table test1 add id int alter table test1 add column id int ~~~ 3.刪除字段 ~~~sql alter table test1 drop column id ~~~ 4.添加索引 ~~~sql alter table test1 add index idx_id(id) ~~~ 三.drop 1.刪除數據庫 ~~~sql drop database + 數據庫名 ~~~ 2.刪除表 ~~~sql drop table test1 ~~~
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