/*
mysql> DROP TABLE Employee;
Query OK, 0 rows affected (0.01 sec)
mysql> CREATE TABLE Employee (
-> Name VARCHAR(50) NOT NULL,
-> Phone VARCHAR(15) DEFAULT 'Unknown Phone' NOT NULL);
Query OK, 0 rows affected (0.06 sec)
mysql> Describe Employee;
+-------+-------------+------+-----+---------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------------+-------+
| Name | varchar(50) | | | | |
| Phone | varchar(15) | | | Unknown Phone | |
+-------+-------------+------+-----+---------------+-------+
2 rows in set (0.00 sec)
mysql> INSERT INTO Employee (Name, Phone) VALUES ('Joe Wang', '666 2323');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO Employee (Name) VALUES ('Joe Wang');
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO Employee (Name, Phone) VALUES ('Joe Wang', NULL);
ERROR 1048 (23000): Column 'Phone' cannot be null
mysql> select * from Friday;
ERROR 1146 (42S02): Table 't.friday' doesn't exist
*/
DROP TABLE Employee;
CREATE TABLE Employee (
Name VARCHAR(50) NOT NULL,
Phone VARCHAR(15) DEFAULT 'Unknown Phone' NOT NULL);
Describe Employee;
INSERT INTO Employee (Name, Phone) VALUES ('Joe Wang', '666 2323');
INSERT INTO Employee (Name) VALUES ('Joe Wang');
INSERT INTO Employee (Name, Phone) VALUES ('Joe Wang', NULL);
select * from Friday;
|