mysql复制一个空表_Mysql 复制一个新表
发布时间:2022-10-11 10:31:55 所属栏目:MySql教程 来源:
导读: 1、复制表结构及数据到新表
这种方法会将oldtable中所有的内容都拷贝过来MySQL 复制表,当然我们可以用delete from newtable;来删除。
不过这种方法的一个最不好的地方就是新表中没有了旧表的pr
这种方法会将oldtable中所有的内容都拷贝过来MySQL 复制表,当然我们可以用delete from newtable;来删除。
不过这种方法的一个最不好的地方就是新表中没有了旧表的pr
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1、复制表结构及数据到新表 这种方法会将oldtable中所有的内容都拷贝过来MySQL 复制表,当然我们可以用delete from newtable;来删除。 不过这种方法的一个最不好的地方就是新表中没有了旧表的primary key、Extra(auto_increment)等属性。需要自己用"alter"添加,而且容易搞错。 2、只复制表结构到新表 或CREATE TABLE 新表 LIKE 旧表 这个和上面一样主键索引和一些属性都会消失。 原来的表: MariaDB [syw]> desc news_person; +-------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(30) | NO | | NULL | | | age | int(11) | NO | | NULL | | +-------+-------------+------+-----+---------+----------------+ 3 rows in set (0.05 sec) 执行后: MariaDB [syw]> create table news_person_new select * from news_person where 1=2; Query OK, 0 rows affected (0.49 sec) Records: 0 Duplicates: 0 Warnings: 0 查看索引: MariaDB [syw]> show index from news_person; +-------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +-------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | news_person | 0 | PRIMARY | 1 | id | A | 0 | NULL | NULL | | BTREE | | | +-------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ 1 row in set (0.00 sec) MariaDB [syw]> show index from news_person_new; Empty set (0.00 sec) 正确方法: CREATE TABLE 新表 LIKE 旧表 MariaDB [syw]> create table news_person_new1 like news_person; Query OK, 0 rows affected (0.24 sec) MariaDB [syw]> desc news_person_new1; +-------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(30) | NO | | NULL | | | age | int(11) | NO | | NULL | | +-------+-------------+------+-----+---------+----------------+ 3 rows in set (0.03 sec) MariaDB [syw]> show index from news_person_new1; +------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | news_person_new1 | 0 | PRIMARY | 1 | id | A | 0 | NULL | NULL | | BTREE | | | +------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ 1 row in set (0.00 sec) (编辑:我爱资讯网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |
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