FLOOR

Description

Round down floating-point and fixed-point decimals to a specific number of digits and return the rounded floating-point or fixed-point number.

Syntax

FLOOR(<a>[, <d>])

Parameters

Parameter	Description
<a>	Floating-point (Double) or fixed-point (Decimal) parameter indicating the parameter to be rounded
<d>	Optional, integer, indicates rounding to the target number of digits, a positive number means rounding to the next decimal point, a negative number means rounding to the next decimal point, and 0 indicates rounding to an integer. When not filled, it is equivalent to <d> = 0.

Return Value

Returns the largest rounded number less than or equal to <a> according to the following rules.

Round to 1/(10^d) digit, i.e., make the result divisible by 1/(10^d). If 1/(10^d) is not exact, the rounding digit is the nearest number of the corresponding data type.

For an entry <a> of type Decimal, assuming it is of type Decimal(p, s), the return value is:

• Decimal(p, 0)，if <d> <= 0
• Decimal(p, <d>)，if 0 < <d> <= s
• Decimal(p, s)，if <d> > s

Alias

• DFLOOR

Examples

select floor(123.456);

+----------------+
| floor(123.456) |
+----------------+
|            123 |
+----------------+

select floor(123.456, 2);

+-------------------+
| floor(123.456, 2) |
+-------------------+
|            123.45 |
+-------------------+

select floor(123.456, -2);

+--------------------+
| floor(123.456, -2) |
+--------------------+
|                100 |
+--------------------+

select floor(123.45, 1), floor(123.45), floor(123.45, 0), floor(123.45, -1);

+------------------+---------------+------------------+-------------------+
| floor(123.45, 1) | floor(123.45) | floor(123.45, 0) | floor(123.45, -1) |
+------------------+---------------+------------------+-------------------+
|            123.4 |           123 |              123 |               120 |
+------------------+---------------+------------------+-------------------+

select floor(x, 2) from ( select cast(123.456 as decimal(6,3)) as x from numbers("number"="5") )t;

+-------------+
| floor(x, 2) |
+-------------+
|      123.45 |
|      123.45 |
|      123.45 |
|      123.45 |
|      123.45 |
+-------------+