/*
mysql> Drop TABLE Employee;
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE TABLE Employee (
-> Name VARCHAR(50) PRIMARY KEY NOT NULL,
-> PhoneNo VARCHAR(15) DEFAULT 'Unknown Phone',
-> SSN VARCHAR(15) NOT NULL,
-> CHECK (SSN LIKE '[0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]'));
Query OK, 0 rows affected (0.07 sec)
mysql> Describe Employee;
+---------+-------------+------+-----+---------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------------+-------+
| Name | varchar(50) | | PRI | | |
| PhoneNo | varchar(15) | YES | | Unknown Phone | |
| SSN | varchar(15) | | | | |
+---------+-------------+------+-----+---------------+-------+
3 rows in set (0.01 sec)
mysql> INSERT INTO Employee (Name, Phone, SSN) VALUES ('Joe Wang', '666 2323', 22
2-22-2222);
ERROR 1054 (42S22): Unknown column 'Phone' in 'field list'
mysql> INSERT INTO Employee (Name, SSN) VALUES ('John Doe', 22-a2-2222);
ERROR 1054 (42S22): Unknown column 'a2' in 'field list'
mysql> INSERT INTO Employee (Name, Phone) VALUES ('Joe Wang', NULL);
ERROR 1054 (42S22): Unknown column 'Phone' in 'field list'
mysql> Select * from Employee;
Empty set (0.00 sec)
*/
Drop TABLE Employee;
CREATE TABLE Employee (
Name VARCHAR(50) PRIMARY KEY NOT NULL,
PhoneNo VARCHAR(15) DEFAULT 'Unknown Phone',
SSN VARCHAR(15) NOT NULL,
CHECK (SSN LIKE '[0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]'));
Describe Employee;
INSERT INTO Employee (Name, Phone, SSN) VALUES ('Joe Wang', '666 2323', 222-22-2222);
INSERT INTO Employee (Name, SSN) VALUES ('John Doe', 22-a2-2222);
INSERT INTO Employee (Name, Phone) VALUES ('Joe Wang', NULL);
Select * from Employee;
|