Create Simple Tables
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/* mysql> DROP TABLE Employee;
mysql> CREATE TABLE Employee ( -> Name VARCHAR(50), -> Phone VARCHAR(15) -> ); Query OK, 0 rows affected (0.21 sec)
mysql> Show tables; +-------------+ | Tables_in_t | +-------------+ | employee | | enrollment | | student | | studentexam | +-------------+ 4 rows in set (0.07 sec)
mysql> Describe Employee; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | Name | varchar(50) | YES | | NULL | | | Phone | varchar(15) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 2 rows in set (0.03 sec)
mysql> INSERT INTO Employee (Name, Phone) VALUES ('Joe Yin', '666 2323'); Query OK, 1 row affected (0.04 sec)
mysql> INSERT INTO Employee (Name) VALUES ('John Doe'); Query OK, 1 row affected (0.02 sec)
mysql> INSERT INTO Employee (Name, Phone) VALUES ('John Doe', NULL); Query OK, 1 row affected (0.01 sec)
mysql> Select * from Employee; +----------+----------+ | Name | Phone | +----------+----------+ | Joe Yin | 666 2323 | | John Doe | NULL | | John Doe | NULL | +----------+----------+ 3 rows in set (0.08 sec)
*/
DROP TABLE Employee;
CREATE TABLE Employee ( Name VARCHAR(50), Phone VARCHAR(15) );
Show tables; 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 ('John Doe', NULL);
Select * from Employee;
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