AUTO_INCREMENT sequences start at one : AUTO_INCREMENT « Data Type « SQL / MySQL






  1. SQL / MySQL
  2. Data Type
  3. AUTO_INCREMENT

AUTO_INCREMENT sequences start at one

       
mysql>
mysql> CREATE TABLE t(
    ->    id INT UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> INSERT INTO t (id) VALUES(NULL);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO t (id) VALUES(NULL);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO t (id) VALUES(NULL);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT id FROM t ORDER BY id;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
+----+
3 rows in set (0.00 sec)

mysql>
mysql> drop table t;
Query OK, 0 rows affected (0.00 sec)








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1.Using AUTO_INCREMENT
2.AUTO_INCREMENT Integers
3.Preserve column attributes such as AUTO_INCREMENT and column's default value during table copying.
4.An AUTO_INCREMENT column
5.For MyISAM tables, you can begin the sequence at a specific initial value n by including an AUTO_INCREMENT = n
6.Using an AUTO_INCREMENT Column to Create Multiple Sequences
7.AUTO_INCREMENT column:
8.Not null tinyint and AUTO_INCREMENT
9.MEDIUMINT NOT NULL AUTO_INCREMENT
10.INTEGER UNSIGNED AUTO_INCREMENT
11.Insert value to AUTO_INCREMENT column
12.delete and reinsert value to AUTO_INCREMENT column
13.SET @@AUTO_INCREMENT_OFFSET = 10,@@AUTO_INCREMENT_INCREMENT = 10
14.Set AUTO_INCREMENT value
15.Parameter: INT NOT NULL AUTO_INCREMENT
16.Create a similar table, preserve the auto-incrementing key
17.Defining Auto-Increment Columns
18.If this value is larger than the current sequence counter, subsequent automatically generated values begin with the value plus one