MySQL FLOOR Function

MySQL FLOOR function is one of the Numeric Functions, which returns the closest integer value that is less than or equal to the specified expression. The syntax of the FLOOR in MySQL is as shown below:

SELECT FLOOR (Numeric_Expression)
FROM Source

To demonstrate this FLOOR Numeric function, we are going to use the below shown data

MySQL FLOOR Function Example 1

The MySQL FLOOR returns the closest integer value less than the specified number. The following query shows multiple ways to use the FLOOR function.

-- MySQL FLOOR Function Example

-- Floor Function on Negative Value
SELECT FLOOR(-120.91) AS `Floor Value`;

-- Floor Function on Positive Value
SELECT FLOOR(205.97) AS `Floor Value`;

-- Floor Function on string value
SELECT FLOOR('801.95') AS `Floor Value`;

-- Floor Function on String
SELECT FLOOR('MySQL') AS `Floor Value`;

-- Floor Function on NULLs
SELECT FLOOR('NULL') AS `Floor Value`;

From the below screenshot, you can see that we used the FLOOR function on different values.

MySQL FLOOR Example 2

The MySQL FLOOR Numeric Function also allows you to find the closest value for the column data. In this example, we are going to find the floor values for all the records present in the Service Grade column.

-- MySQL FLOOR Function Example
USE mysqltutorial;
SELECT Product, Color,
		StandardCost, FLOOR(StandardCost) AS Cost, 
        Sales, FLOOR(Sales) AS Sales, 
        TaxAmt, FLOOR(TaxAmt) AS Tax,
        ServiceGrade, FLOOR(ServiceGrade) AS Grade
FROM `numeric functions`;

MySQL FLOOR WHERE Clause Example

We can also use this MySQL FLOOR in Where Clause as well. In this example, we use Floor function in where clause to restrict the records selected by the SELECT Statement.

-- MySQL FLOOR Function Example
USE mysqltutorial;
SELECT Product, Color,
		StandardCost, FLOOR(StandardCost) AS Cost, 
        Sales, FLOOR(Sales) AS Sales, 
        TaxAmt, FLOOR(TaxAmt) AS Tax,
        ServiceGrade, FLOOR(ServiceGrade) AS Grade
FROM `numeric functions`
WHERE FLOOR(TaxAmt) > 200;