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Help Center/ TaurusDB/ Troubleshooting/ Basic Issues/ Auto-increment Field Values

Auto-increment Field Values

Updated on 2024-12-30 GMT+08:00

TaurusDB uses the following methods to assign values to an auto-increment field:

# Table structure
CREATE TABLE animals (
     id MEDIUMINT NOT NULL AUTO_INCREMENT,
     name CHAR(30) NOT NULL,
     PRIMARY KEY (id)
);
  1. If no value is specified for the auto-increment field, TaurusDB automatically enters the value of AUTO_INCREMENT to the field.
    1. Insert records into the table.
       INSERT INTO animals (name) VALUES ('dog'),('cat'),('penguin'),('lax'),('whale'),('ostrich');
    2. Querying table data
       select * from animals;
      +----+---------+
      | id | name    |
      +----+---------+
      |  1 | dog     |
      |  2 | cat     |
      |  3 | penguin |
      |  4 | lax     |
      |  5 | whale   |
      |  6 | ostrich |
      +----+---------+
    3. Query the table structure.
       show create table animals;
      +---------+--------------------------------------------------+
      | Table   | Create Table                          |
      +---------+--------------------------------------------------+
      | animals | CREATE TABLE `animals` (  `id` mediumint NOT NULL AUTO_INCREMENT,  `name` char(30) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8 |
      +---------+--------------------------------------------------+
  2. If 0 or NULL is specified for the auto-increment field, TaurusDB automatically enters the value of AUTO_INCREMENT to the field.
    1. Insert records into the table.
      INSERT INTO animals (id,name) VALUES(0,'groundhog');
      INSERT INTO animals (id,name) VALUES(NULL,'squirrel');
    2. Query data.
      select * from animals;
      +----+-----------+
      | id | name      |
      +----+-----------+
      |  1 | dog       |
      |  2 | cat       |
      |  3 | penguin   |
      |  4 | lax       |
      |  5 | whale     |
      |  6 | ostrich   |
      |  7 | groundhog |
      |  8 | squirrel  |
      +----+-----------+
      8 rows in set (0.00 sec) 
    3. Query the table structure.
      show create table animals;
      +---------+----------------------------------------------------------------+
      | Table   | Create Table                                                                             |
      +---------+----------------------------------------------------------------+
      | animals | CREATE TABLE `animals` (  `id` mediumint NOT NULL AUTO_INCREMENT,  `name` char(30) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 |
      +---------+------------------------------------------------------------+
  3. If the value X that is greater than the value of AUTO_INCREMENT is specified for the auto-increment field, TaurusDB inserts X to the field and changes AUTO_INCREMENT to X + 1.
    1. Insert records into the table.
      INSERT INTO animals (id,name) VALUES(100,'rabbit');
    2. Query data.
      select * from animals;
      +-----+-----------+
      | id  | name      |
      +-----+-----------+
      |   1 | dog       |
      |   2 | cat       |
      |   3 | penguin   |
      |   4 | lax       |
      |   5 | whale     |
      |   6 | ostrich   |
      |   7 | groundhog |
      |   8 | squirrel  |
      | 100 | rabbit    |
      +-----+-----------+
      9 rows in set (0.00 sec) 
    3. Query the table structure.
      show create table animals;
      +---------+----------------------------------------------------------------------+
      | Table   | Create Table                                                                                      |
      +---------+----------------------------------------------------------------------+
      | animals | CREATE TABLE `animals` (  `id` mediumint NOT NULL AUTO_INCREMENT,  `name` char(30) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=101 DEFAULT CHARSET=utf8 |
      +---------+----------------------------------------------------------------------+
  4. If a value less than the value of AUTO_INCREMENT is specified for the auto-increment field, TaurusDB enters the value to the field and AUTO_INCREMENT remains unchanged.
    mysql> INSERT INTO animals (id,name) VALUES(50,'middle');
    Query OK, 1 row affected (0.00 sec) 
    mysql> select * from animals;
    +-----+-----------+
    | id  | name      |
    +-----+-----------+
    |   1 | dog       |
    |   2 | cat       |
    |   3 | penguin   |
    |   4 | lax       |
    |   5 | whale     |
    |   6 | ostrich   |
    |   7 | groundhog |
    |   8 | squirrel  |
    |  50 | middle    |
    | 100 | rabbit    |
    +-----+-----------+
    10 rows in set (0.00 sec) 
    mysql> show create table animals;
    +---------+------------------------------------------------------------------+
    | Table   | Create Table                                                                               |
    +---------+------------------------------------------------------------------+
    | animals | CREATE TABLE `animals` (  `id` mediumint NOT NULL AUTO_INCREMENT,  `name` char(30) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=101 DEFAULT CHARSET=utf8 |
    +---------+------------------------------------------------------------------+
  5. If a negative value is specified for the auto-increment field, TaurusDB enters the value to the field and AUTO_INCREMENT remains unchanged.
    1. Insert records into the table.
      INSERT INTO animals (id,name) VALUES(-50,'-middle');
    2. Queries data.
      select * from animals;
      +-----+-----------+
      | id  | name      |
      +-----+-----------+
      | -50 | -middle   |
      |   1 | dog       |
      |   2 | cat       |
      |   3 | penguin   |
      |   4 | lax       |
      |   5 | whale     |
      |   6 | ostrich   |
      |   7 | groundhog |
      |   8 | squirrel  |
      |  50 | middle    |
      | 100 | rabbit    |
      +-----+-----------+
      11 rows in set (0.00 sec)
    3. Query the table structure.
      show create table animals;
      +---------+------------------------------------------------------------------------------------+
      | Table   | Create Table                                                                      
      +---------+------------------------------------------------------------------------------------+
      | animals | CREATE TABLE `animals` (  `id` mediumint NOT NULL AUTO_INCREMENT,  
      `name` char(30) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=101 DEFAULT CHARSET=utf8         |
      +---------+-----------------------------------------------------------------------------------+

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