TEST_INCREMENT

CREATE TABLE TEST_INCREMENT
(
—- UNSIGNED:将数字类型无符号化，扩大整形数值的范围
ID        BIGINT(20)    UNSIGNED    NOT NULL    AUTO_INCREMENT        primary key,
TEST_NAME    VARCHAR(20)
);

DESCRIBE TEST_INCREMENT;
+-----------+---------------------+------+-----+---------+----------------+
| Field     | Type                | Null | Key | Default | Extra          |
+-----------+---------------------+------+-----+---------+----------------+
| ID        | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| TEST_NAME | varchar(20)         | YES  |     | NULL    |                |
+-----------+---------------------+------+-----+---------+----------------+

INSERT INTO TEST_INCREMENT VALUES ( NULL, ‘HOWARD‘);
INSERT INTO TEST_INCREMENT VALUES ( NULL, ‘TOMMY‘);
INSERT INTO TEST_INCREMENT VALUES ( NULL, ‘LEE‘);

SELECT * FROM TEST_INCREMENT;
+----+-----------+
| ID | TEST_NAME |
+----+-----------+
|  1 | HOWARD    |
|  2 | TOMMY     |
|  3 | LEE       |
+----+-----------+