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Getting a Random Value Between Two Values in MySQL

This question arises from the need to retrieve a random value between two specific values stored in MySQL columns, namely min_value and max_value. While the questioner initially considered employing the RAND() function, they realized its limitations in this scenario.

The Solution

The most efficient method to achieve this in MySQL is indeed to utilize the expression ROUND((RAND() * (max-min)) min). This formula generates a random float within the desired range, which can then be rounded to the nearest integer if necessary.

MySQL vs PHP

The question also explores the potential performance advantages of handling the randomization in PHP versus MySQL. To investigate this, a series of tests were conducted, returning either only the random value or additional columns alongside it.

Results

When only the random value was returned, MySQL outperformed PHP marginally. However, when additional columns were included in the query, PHP showed a slight edge.

Conclusion

The best approach depends on the specific requirements:

• For random values only: Use MySQL for slightly faster performance.
• For random values with additional columns: Consider using PHP for better efficiency.

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