Difference Between ROUND(), TRUNCATE(), and FORMAT() in MySQL
MySQL provides ROUND(), TRUNCATE(), and FORMAT() for handling decimal numbers, but each performs a different type of numeric transformation: rounding, cutting digits, or formatting for display.
Rounds a number to the nearest value.
Uses standard rounding rules (0.5 and above → round up).
Can round to a positive or negative number of decimal places.
Cuts off digits without rounding.
Simply removes extra decimals.
Useful for financial or precise trimming operations.
Returns the number as a string.
Adds thousands separators based on locale (default: US).
Rounds the number to the given number of decimal places.
Useful for display, not for calculations.
ROUND(): Rounds the value.
TRUNCATE(): Cuts digits without rounding.
FORMAT(): Returns a formatted string with commas and rounding.
In summary: Use ROUND() for mathematical rounding, TRUNCATE() for precise digit cutting, and FORMAT() for user-friendly number display.