Hi @scuffster   There are some interesting issues here with the different numeric data types here - INT, DOUBLE, DECIMAL, etc. The behaviour you're seeing is because the first input to round() is a DOUBLE expression, which cannot exactly represent all decimal values. Generally the output type of the round() function is the same as the input type.   Impala does support precise decimal arithmetic with the DECIMAL type. If you are operating on DECIMAL columns or you cast the input to a decimal type with the right precision and scale, you may get the behaviour you're hoping for. Here's a query showing the type of your expressions and an alternative version with a cast to DECIMAL:   > select typeof(269586/334026 * 100), typeof(round(269586/334026 * 100, 2)), round(269586/334026 * 100, 2), round(cast(269586/334026 * 100 as DECIMAL(20, 8)), 2); +-------------------------------+-----------------------------------------+---------------------------------+--------------------------------------------------------+ | typeof(269586 / 334026 * 100) | typeof(round(269586 / 334026 * 100, 2)) | round(269586 / 334026 * 100, 2) | round(cast(269586 / 334026 * 100 as decimal(20,8)), 2) | +-------------------------------+-----------------------------------------+---------------------------------+--------------------------------------------------------+ | DOUBLE | DOUBLE | 80.70999999999999 | 80.71 | +-------------------------------+-----------------------------------------+---------------------------------+--------------------------------------------------------+ ... View more