INTEGER UNSIGNED AUTO_INCREMENT : AUTO_INCREMENT « Data Type « SQL / MySQL






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

INTEGER UNSIGNED AUTO_INCREMENT

       
mysql>
mysql> CREATE TABLE CITY_NAMES
    ->       (SEQNO   INTEGER UNSIGNED AUTO_INCREMENT
    ->                NOT NULL PRIMARY KEY,
    ->        NAME    VARCHAR(30) NOT NULL);
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> INSERT INTO CITY_NAMES VALUES (NULL, 'London')
    -> ;
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO CITY_NAMES VALUES (NULL, 'New York')
    -> ;
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO CITY_NAMES (NAME) VALUES ('Paris')
    -> ;
Query OK, 1 row affected (0.00 sec)

mysql> SELECT * FROM CITY_NAMES;
+-------+----------+
| SEQNO | NAME     |
+-------+----------+
|     1 | London   |
|     2 | New York |
|     3 | Paris    |
+-------+----------+
3 rows in set (0.00 sec)

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








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5.AUTO_INCREMENT sequences start at one
6.For MyISAM tables, you can begin the sequence at a specific initial value n by including an AUTO_INCREMENT = n
7.Using an AUTO_INCREMENT Column to Create Multiple Sequences
8.AUTO_INCREMENT column:
9.Not null tinyint and AUTO_INCREMENT
10.MEDIUMINT NOT NULL 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