ROUND

round

description

Syntax

T round(T x[, d]) Rounds the argument x to d decimal places. d defaults to 0 if not specified. If d is negative, the left d digits of the decimal point are 0. If x or d is null, null is returned. 2.5 will round up to 3. If you want to round down to 2, please use the round_bankers function.

If d is a column, and x has Decimal type, scale of result Decimal will always be same with input Decimal.

tip

Another alias for this function is dround.

example

mysql> select round(2.4);
+------------+
| round(2.4) |
+------------+
|          2 |
+------------+
mysql> select round(2.5);
+------------+
| round(2.5) |
+------------+
|          3 |
+------------+
mysql> select round(-3.4);
+-------------+
| round(-3.4) |
+-------------+
|          -3 |
+-------------+
mysql> select round(-3.5);
+-------------+
| round(-3.5) |
+-------------+
|          -4 |
+-------------+
mysql> select round(1667.2725, 2);
+---------------------+
| round(1667.2725, 2) |
+---------------------+
|             1667.27 |
+---------------------+
mysql> select round(1667.2725, -2);
+----------------------+
| round(1667.2725, -2) |
+----------------------+
|                 1700 |
+----------------------+
mysql> SELECT number
    -> , round(number * 2.5, number - 1) AS r_decimal_column
    -> , round(number * 2.5, 0) AS r_decimal_literal
    -> , round(cast(number * 2.5 AS DOUBLE), number - 1) AS r_double_column
    -> , round(cast(number * 2.5 AS DOUBLE), 0) AS r_double_literal
    -> FROM test_enhanced_round
    -> WHERE rid = 1;
+--------+------------------+-------------------+-----------------+------------------+
| number | r_decimal_column | r_decimal_literal | r_double_column | r_double_literal |
+--------+------------------+-------------------+-----------------+------------------+
|      1 |              3.0 |                 3 |               3 |                3 |
+--------+------------------+-------------------+-----------------+------------------+

keywords

ROUND, DROUND