How to populate a MySQL table with random numbers using a stored procedure?

Populating a MySQL Table with Random Numbers Using a Stored Procedure

Populating a MySQL table with many random numbers requires a systematic approach. This article demonstrates how to create such a table (rand_numbers) with one column (number) of type INT and 1111 rows, where each row contains a random number between 2222 and 5555.

To accomplish this task, we utilize a stored procedure (InsertRand) that iterates through the desired number of rows and inserts random numbers within the specified range (MinVal and MaxVal) into the rand_numbers table. This procedure simplifies the insertion process and enables reuse for various data sets.

Creating the Table

First, the rand_numbers table is created using the CREATE TABLE statement:

CREATE TABLE rand_numbers (number INT NOT NULL) ENGINE = MYISAM;

Populating the Table

Next, the InsertRand stored procedure is defined:

DELIMITER $$
CREATE PROCEDURE InsertRand(IN NumRows INT, IN MinVal INT, IN MaxVal INT)
    BEGIN
        DECLARE i INT;
        SET i = 1;
        START TRANSACTION;
        WHILE i <= NumRows DO
            INSERT INTO rand_numbers VALUES (MinVal + CEIL(RAND() * (MaxVal - MinVal)));
            SET i = i + 1;
        END WHILE;
        COMMIT;
    END$$
DELIMITER ;

This procedure takes three parameters: NumRows (the number of rows to insert), MinVal (the minimum value of the random number), and MaxVal (the maximum value of the random number).

To populate the table with 1111 random numbers between 2222 and 5555, the following statement is executed:

CALL InsertRand(1111, 2222, 5555);

Reusing the Procedure

The InsertRand procedure can be reused to insert additional random numbers with different parameters. For instance, to insert 600 rows with random values between 1200 and 8500:

CALL InsertRand(600, 1200, 8500);

This versatile stored procedure provides a convenient and efficient method for populating MySQL tables with large volumes of random numbers.

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