CRC32() Function in MySQL

CRC32() function in MySQL is used to compute cyclic redundancy value. It returns NULL if the argument is NULL otherwise, it returns a 32-bit unsigned value after computing the redundancy. Syntax :

CRC32(expr)

Parameter : This method accepts only one parameter.

• expr -It is a string whose CRC32 value is to be retrieved.

Returns : It returns cyclic redundancy value. Example-1 : Finding cyclic redundancy value for a string using CRC32 Function.

SELECT CRC32('geeksforgeeks') 
AS CRC_Value;

Output :

CRC_Value
114079174

Example-2 : Finding cyclic redundancy value for a number using CRC32 Function.

SELECT CRC32( 2020 ) 
AS CRC_Value;

Output :

CRC_Value
2493804155

Example-3 : Finding cyclic redundancy value for a NULL argument using CRC32 Function.

SELECT CRC32(NULL) 
AS CRC_Value;

Output :

CRC_Value
NULL

Example-4 : Using CRC32 Function to find cyclic redundancy value for a column data. To demonstrate, let us create a table named Player.

CREATE TABLE Player
(
Player_id INT AUTO_INCREMENT,  
Player_name VARCHAR(100) NOT NULL,
Playing_team VARCHAR(20) NOT NULL,
PRIMARY KEY(Player_id )
);

Now, insert some data to the Player table.

INSERT INTO  
Player(Player_name, Playing_team)
VALUES
('Virat Kohli', 'RCB' ),
('Rohit Sharma', 'MI' ),
('Dinesh Karthik', 'KKR'  ),
('Shreyash Iyer', 'DC'  ),
('David Warner', 'SRH' ),
('Steve Smith', 'RR'  ),
('Andre Russell', 'KKR' ),
('Jasprit Bumrah', 'MI' ),
('Risabh Panth', 'DC'  ) ;

So, the Player Table is as follows.

SELECT * FROM Player;

Output :

Player_id	Player_name	Playing_team
1	Virat Kohli	RCB
2	Rohit Sharma	MI
3	Dinesh Karthik	KKR
4	Shreyash Iyer	DC
5	David Warner	SRH
6	Steve Smith	RR
7	Andre Russell	KKR
8	Jasprit Bumrah	MI
9	Risabh Panth	DC

Now, we will find cyclic redundancy value for Player_name and Playing_team column using CRC32 Function.

SELECT 
*, CRC32(Player_name),
CRC32(Playing_team)
FROM Player;

Output :

Player_id	Player_name	Playing_team	CRC32 (Player_name)	CRC32 (Playing_team)
1	Virat Kohli	RCB	4234533515	3556712374
2	Rohit Sharma	MI	2696911654	185522819
3	Dinesh Karthik	KKR	703307832	359013669
4	Shreyash Iyer	DC	2817545593	974751956
5	David Warner	SRH	3645256088	1630650255
6	Steve Smith	RR	777202257	1278287345
7	Andre Russell	KKR	3090306698	359013669
8	Jasprit Bumrah	MI	191461017	185522819
9	Risabh Panth	DC	178998608	974751956