docs/sql-manual/sql-functions/numeric-functions/floor.md

---
{
    "title": "FLOOR",
    "language": "en"
}
---

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## floor

### description
#### Syntax

`T floor(T x[, d])`

If not specified `d`: returns the largest integer value less than or equal to `x`, which is **the most common usage**.
Otherwise, returns the largest round number that is less than or equal to `x` and flowing the rules:

If `d` is specified as literal:  
`d` = 0: just like without `d`
`d` > 0 or `d` < 0: the round number would be a multiple of `1/(10^d)`, or the nearest number of the appropriate data type if `1/(10^d)` isn't exact.

Else 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 `dfloor`.
:::

### example

```
mysql> select floor(1);
+------------+
| floor(1.0) |
+------------+
|          1 |
+------------+
mysql> select floor(2.4);
+------------+
| floor(2.4) |
+------------+
|          2 |
+------------+
mysql> select floor(-10.3);
+--------------+
| floor(-10.3) |
+--------------+
|          -11 |
+--------------+
mysql> 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 |
+------------------+---------------+------------------+-------------------+
mysql> SELECT number
    -> , floor(number * 2.5, number - 1) AS f_decimal_column
    -> , floor(number * 2.5, 0) AS f_decimal_literal
    -> , floor(cast(number * 2.5 AS DOUBLE), number - 1) AS f_double_column
    -> , floor(cast(number * 2.5 AS DOUBLE), 0) AS f_double_literal
    -> FROM test_enhanced_round
    -> WHERE rid = 1;
+--------+------------------+-------------------+-----------------+------------------+
| number | f_decimal_column | f_decimal_literal | f_double_column | f_double_literal |
+--------+------------------+-------------------+-----------------+------------------+
|      1 |              2.0 |                 2 |               2 |                2 |
+--------+------------------+-------------------+-----------------+------------------+
```

### keywords
	FLOOR, DFLOOR