Copy Table Demo
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/*
mysql> Describe Employee; +---------+-------------+------+-----+---------------+-------+ | Field | Type | Null | Key | Default | Extra | +---------+-------------+------+-----+---------------+-------+ | Name | varchar(50) | | PRI | | | | PhoneNo | varchar(15) | YES | | Unknown Phone | | | Age | int(11) | YES | | NULL | | +---------+-------------+------+-----+---------------+-------+ 3 rows in set (0.01 sec)
mysql> Select * from Employee; +----------+---------------+------+ | Name | PhoneNo | Age | +----------+---------------+------+ | John Doe | Unknown Phone | 31 | +----------+---------------+------+ 1 row in set (0.00 sec)
mysql> /* Now copy the table */ mysql> CREATE TABLE MyEmployee SELECT * FROM Employee ; Query OK, 1 row affected (0.05 sec) Records: 1 Duplicates: 0 Warnings: 0
mysql> select * from MyEmployee; +----------+---------------+------+ | Name | PhoneNo | Age | +----------+---------------+------+ | John Doe | Unknown Phone | 31 | +----------+---------------+------+ 1 row in set (0.01 sec)
*/ Drop TABLE Employee; Drop TABLE MyEmployee;
CREATE TABLE Employee ( Name VARCHAR(50) PRIMARY KEY NOT NULL, Phone VARCHAR(15) DEFAULT 'Unknown Phone', Age INT CHECK (Age BETWEEN 20 and 30));
Describe Employee;
INSERT INTO Employee (Name, Phone, Age) VALUES ('Joe Yin', '666 2323', 26); INSERT INTO Employee (Name, Age) VALUES ('John Doe', 31); INSERT INTO Employee (Name, Phone) VALUES ('Joe Yin', NULL);
Select * from Employee;
/* Now copy the table */ CREATE TABLE MyEmployee SELECT * FROM Employee ;
select * from MyEmployee;
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