极客教程MySQL 如何查看表的 auto_increment 值
要查看表的 auto_increment 值，可以使用 SHOW TABLE 命令。
语法如下：
SHOW TABLE STATUS LIKE 'yourTableName'\GMysql
语法如下：
SELECT `AUTO_INCREMENT`
FROM `information_schema`.`TABLES`
WHERE `TABLE_SCHEMA` = ‘yourDatabaseName’
AND `TABLE_NAME` =’yourTableName';Mysql
要理解上述语法，让我们创建一个表。 创建表的查询语句如下：
mysql> create table viewAutoIncrementDemo
-> (
-> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> UserName varchar(20)
-> );
Query OK, 0 rows affected (0.59 sec)Mysql
现在你可以使用插入命令在表中插入一些记录。 查询语句如下：
mysql> insert into viewAutoIncrementDemo(UserName) values('John');
Query OK, 1 row affected (0.18 sec)
mysql> insert into viewAutoIncrementDemo(UserName) values('Carol');
Query OK, 1 row affected (0.14 sec)
mysql> insert into viewAutoIncrementDemo(UserName) values('Bob');
Query OK, 1 row affected (0.08 sec)
mysql> insert into viewAutoIncrementDemo(UserName) values('Sam');
Query OK, 1 row affected (0.12 sec)
mysql> insert into viewAutoIncrementDemo(UserName) values('Mike');
Query OK, 1 row affected (0.14 sec)
mysql> insert into viewAutoIncrementDemo(UserName) values('David');
Query OK, 1 row affected (0.16 sec)
mysql> insert into viewAutoIncrementDemo(UserName) values('Larry');
Query OK, 1 row affected (0.11 sec)Mysql
使用 select 语句显示表的所有记录。 查询语句如下：
mysql> select *from viewAutoIncrementDemo;Mysql
下面是输出结果：
+--------+----------+
| UserId | UserName |
+--------+----------+
| 1 | John |
| 2 | Carol |
| 3 | Bob |
| 4 | Sam |
| 5 | Mike |
| 6 | David |
| 7 | Larry |
+--------+----------+
7 rows in set (0.00 sec)Mysql
下面是查看表的 auto_increment 值的查询语句：
mysql> SHOW TABLE STATUS LIKE 'viewAutoIncrementDemo'\GMysql
下面是输出结果：
*************************** 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)Mysql
下面是第二个查询语句：
mysql> SELECT `AUTO_INCREMENT`
-> FROM `information_schema`.`TABLES`
-> WHERE `TABLE_SCHEMA` = 'sample'
-> AND `TABLE_NAME` = 'viewAutoIncrementDemo';Mysql
下面是输出结果：
+----------------+
| AUTO_INCREMENT |
+----------------+
| 8 |
+----------------+
1 row in set (0.00 sec)Mysql
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