Truncation is a process of limiting the number of digits to the right of the decimal point. It is used in mathematics and computer science to make an estimate of a number without rounding. To truncate a number, we omit digits beyond a certain point in the number, filling in zeros if necessary to make the truncated number approximately the same size as the original number. An easy way to truncate a positive value is to subtract 0.5 from it and then round it.

The SQL TRUNCATE() function returns n truncated to d decimal places. If you omit d, n is truncated to 0 decimal places. If d is a negative number, the function truncates the number n to d digits to the left of the decimal point. The TRUNC(number) function returns n1 truncated to n2 decimal places.

If n2 is omitted, then n1 is truncated to 0 places. N2 can be negative to truncate (make zero) n2 digits to the left of the decimal point. Truncation is a useful tool for making estimates without rounding numbers. It can be used in mathematics and computer science to make calculations more accurate and efficient.

Understanding how it works can help you make better decisions when dealing with numbers and data.