Returns the largest integer that is less than or equal to the input number.
Syntax
bigint floor(<number>)Parameters
| Parameter | Required | Accepted types | Description |
|---|---|---|---|
number | Yes | DOUBLE, DECIMAL | The value to round down. STRING and BIGINT values are implicitly converted to DOUBLE before the calculation. |
Return value
Returns a value of the BIGINT type. Returns null if number is null.
FLOOR always returns BIGINT, regardless of the input type. If you pass a DECIMAL value, the fractional part is discarded and the result is BIGINT.
Usage notes
Negative numbers round toward negative infinity. For example, floor(-1.2) returns -2, not -1. Rounding down moves toward negative infinity, not toward zero.
Examples
Static values
select floor(1.2); -- Returns 1
select floor(0.1); -- Returns 0
select floor(-1.2); -- Returns -2
select floor(-0.1); -- Returns -1
select floor(0.0); -- Returns 0
select floor(-0.0); -- Returns 0
select floor(null); -- Returns nullTable data
The following examples use the mf_math_fun_t table. To create and populate the table:
create table if not exists mf_math_fun_t(
int_data int,
bigint_data bigint,
double_data double,
decimal_data decimal,
float_data float,
string_data string
);
insert into mf_math_fun_t values
(null, -10, 0.525, 0.525BD, cast(0.525 as float), '10'),
(-20, null, -0.1, -0.1BD, cast(-0.1 as float), '-10'),
(0, -1, null, 20.45BD, cast(-1 as float), '30'),
(-40, 4, 0.89, null, cast(0.89 as float), '-30'),
(5, -50, -1, -1BD, null, '50'),
(-60, 6, 1.5, 1.5BD, cast(1.5 as float), '-50'),
(-1, -70, -7.5, -7.5BD, cast(-7.5 as float), null),
(-80, 1, -10.2, -10.2BD, cast(-10.2 as float), '-1'),
(9, -90, 2.58, 2.58BD, cast(2.58 as float), '0'),
(-100, 10, -5.8, -5.8BD, cast(-5.8 as float), '-90');Query the table to verify the data:
select * from mf_math_fun_t;+------------+-------------+-------------+--------------+------------+-------------+
| int_data | bigint_data | double_data | decimal_data | float_data | string_data |
+------------+-------------+-------------+--------------+------------+-------------+
| NULL | -10 | 0.525 | 0.525 | 0.525 | 10 |
| -20 | NULL | -0.1 | -0.1 | -0.1 | -10 |
| 0 | -1 | NULL | 20.45 | -1.0 | 30 |
| -40 | 4 | 0.89 | NULL | 0.89 | -30 |
| 5 | -50 | -1.0 | -1 | NULL | 50 |
| -60 | 6 | 1.5 | 1.5 | 1.5 | -50 |
| -1 | -70 | -7.5 | -7.5 | -7.5 | NULL |
| -80 | 1 | -10.2 | -10.2 | -10.2 | -1 |
| 9 | -90 | 2.58 | 2.58 | 2.58 | 0 |
| -100 | 10 | -5.8 | -5.8 | -5.8 | -90 |
+------------+-------------+-------------+--------------+------------+-------------+Apply FLOOR to BIGINT, DOUBLE, DECIMAL, and STRING columns:
select floor(bigint_data) as bigint_new,
floor(double_data) as double_new,
floor(decimal_data) as decimal_new,
floor(string_data) as string_new
from mf_math_fun_t;+------------+------------+-------------+------------+
| bigint_new | double_new | decimal_new | string_new |
+------------+------------+-------------+------------+
| -10 | 0 | 0 | 10 |
| NULL | -1 | -1 | -10 |
| -1 | NULL | 20 | 30 |
| 4 | 0 | NULL | -30 |
| -50 | -1 | -1 | 50 |
| 6 | 1 | 1 | -50 |
| -70 | -8 | -8 | NULL |
| 1 | -11 | -11 | -1 |
| -90 | 2 | 2 | 0 |
| 10 | -6 | -6 | -90 |
+------------+------------+-------------+------------+Related functions
FLOOR is a mathematical function. For more information about functions related to data computing and conversion, see Mathematical functions.