Returns a numeric value, rounded to the specified length or precision and then truncated to the appropriate number of places.
NOTE: This function is equivalent to ROUND in T-SQL, with a third argument (function) of 1.
Numeric
TRUNC( numExpr, length )
where:
When length is a positive number, numExpr is rounded to the number of decimal positions specified by length. When length is a negative number, numExpr is rounded on the left side of the decimal point, as specified by length.