如何在 MySQL 中创建和使用序列？

要在 MySQL 中创建序列，可以在列上使用 auto_increment。它从 值1，并且每插入一条记录就加1。

首先，借助CREATE table 创建一个表。查询如下 -

mysql> CREATE table SequenceDemo -> ( -> SequenceId int auto_increment, -> primary key(SequenceId) -> ); Query OK, 0 rows affected (1.22 sec)登录后复制

mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.19 sec) mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.14 sec) mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.10 sec) mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.12 sec) mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.09 sec)登录后复制

mysql> SELECT * from SequenceDemo; 登录后复制登录后复制

+------------+ | SequenceId | +------------+ | 1 | | 2 | | 3 | | 4 | | 5 | +------------+ 5 rows in set (0.00 sec)登录后复制

alter table yourTableName auto_increment=Somevalue; 登录后复制

mysql> alter table SequenceDemo auto_increment = 500; Query OK, 0 rows affected (0.17 sec) Records: 0 Duplicates: 0 Warnings: 0登录后复制

mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.15 sec) mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.15 sec) mysql> INSERT into SequenceDemo values(); Query OK, 1 row affected (0.05 sec)登录后复制

mysql> SELECT * from SequenceDemo; 登录后复制登录后复制

+------------+ | SequenceId | +------------+ | 1 | | 2 | | 3 | | 4 | | 5 | | 500 | | 501 | | 502 | +------------+ 8 rows in set (0.00 sec)登录后复制

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