ROUND

Syntax

ROUND(X), ROUND(X,D)

Description

Rounds the argument X to D decimal places. D defaults to 0 if not specified. D can be negative to cause D digits left of the decimal point of the value X to become zero.

The rounding algorithm depends on the data type of X:

• for floating point types (FLOAT, DOUBLE) the C libraries rounding function is used, so the behavior *may* differ between operating systems
• for fixed point types (DECIMAL, DEC/NUMBER/FIXED) the "round half up" rule is used, meaning that e.g. a value ending in exactly .5 is always rounded up.

Examples

SELECT ROUND(-1.23);
+--------------+
| ROUND(-1.23) |
+--------------+
|           -1 |
+--------------+

SELECT ROUND(-1.58);
+--------------+
| ROUND(-1.58) |
+--------------+
|           -2 |
+--------------+

SELECT ROUND(1.58); 
+-------------+
| ROUND(1.58) |
+-------------+
|           2 |
+-------------+

SELECT ROUND(1.298, 1);
+-----------------+
| ROUND(1.298, 1) |
+-----------------+
|             1.3 |
+-----------------+

SELECT ROUND(1.298, 0);
+-----------------+
| ROUND(1.298, 0) |
+-----------------+
|               1 |
+-----------------+

SELECT ROUND(23.298, -1);
+-------------------+
| ROUND(23.298, -1) |
+-------------------+
|                20 |
+-------------------+