如何在MySQL中查看表的auto_increment值？
为了查看表的auto_increment值，可以使用SHOWTABLE命令。
语法如下
SHOW TABLE STATUS LIKE 'yourTableName'\G
语法如下
SELECT `AUTO_INCREMENT` FROM `information_schema`.`TABLES` WHERE `TABLE_SCHEMA` = ‘yourDatabaseName’ AND `TABLE_NAME` =’yourTableName';
要了解上述语法，让我们创建一个表。创建表的查询如下
mysql> create table viewAutoIncrementDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20) -> );
现在，您可以使用insert命令在表中插入一些记录。查询如下-
mysql> insert into viewAutoIncrementDemo(UserName) values('John');
mysql> insert into viewAutoIncrementDemo(UserName) values('Carol');
mysql> insert into viewAutoIncrementDemo(UserName) values('Bob');
mysql> insert into viewAutoIncrementDemo(UserName) values('Sam');
mysql> insert into viewAutoIncrementDemo(UserName) values('Mike');
mysql> insert into viewAutoIncrementDemo(UserName) values('David');
mysql> insert into viewAutoIncrementDemo(UserName) values('Larry');使用select语句显示表中的所有记录。查询如下-
mysql> select *from viewAutoIncrementDemo;
以下是输出
+--------+----------+ | UserId | UserName | +--------+----------+ | 1 | John | | 2 | Carol | | 3 | Bob | | 4 | Sam | | 5 | Mike | | 6 | David | | 7 | Larry | +--------+----------+ 7 rows in set (0.00 sec)
这是查看表的auto_increment值的查询
mysql> SHOW TABLE STATUS LIKE 'viewAutoIncrementDemo'\G
以下是输出
*************************** 1. row ***************************
Name: viewautoincrementdemo
Engine: InnoDB
Version: 10
Row_format: Dynamic
Rows: 7
Avg_row_length: 2340
Data_length: 16384
Max_data_length: 0
Index_length: 0
Data_free: 0
Auto_increment: 8
Create_time: 2019-03-02 04:05:20
Update_time: 2019-03-02 04:06:11
Check_time: NULL
Collation: utf8_general_ci
Checksum: NULL
Create_options:
Comment:
1 row in set (0.08 sec)以下是第二个查询
mysql> SELECT `AUTO_INCREMENT` -> FROM `information_schema`.`TABLES` -> WHERE `TABLE_SCHEMA` = 'sample' -> AND `TABLE_NAME` = 'viewAutoIncrementDemo';
以下是输出
+----------------+ | AUTO_INCREMENT | +----------------+ | 8 | +----------------+ 1 row in set (0.00 sec)