Setting a Primary Key 3
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/*
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' NOT NULL);
Query OK, 0 rows affected (0.07 sec)
mysql> Describe Employee;
+---------+-------------+------+-----+---------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------------+-------+
| Name | varchar(50) | | PRI | | |
| PhoneNo | varchar(15) | | | Unknown Phone | |
+---------+-------------+------+-----+---------------+-------+
2 rows in set (0.00 sec)
mysql> INSERT INTO Employee (Name, Phone) VALUES ('Joe Yin', '666 2323');
ERROR 1054 (42S22): Unknown column 'Phone' in 'field list'
mysql> INSERT INTO Employee (Name) VALUES ('John Doe');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO Employee (Name, Phone) VALUES ('Joe Yin', NULL);
ERROR 1054 (42S22): Unknown column 'Phone' in 'field list'
mysql> Select * from Employee;
+----------+---------------+
| Name | PhoneNo |
+----------+---------------+
| John Doe | Unknown Phone |
+----------+---------------+
1 row in set (0.00 sec)
**/
Drop TABLE Employee;
CREATE TABLE Employee (
Name VARCHAR(50) PRIMARY KEY NOT NULL,
PhoneNo VARCHAR(15) DEFAULT 'Unknown Phone' NOT NULL);
Describe Employee;
INSERT INTO Employee (Name, Phone) VALUES ('Joe Yin', '666 2323');
INSERT INTO Employee (Name) VALUES ('John Doe');
INSERT INTO Employee (Name, Phone) VALUES ('Joe Yin', NULL);
Select * from Employee;
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