Floor mysql function returns the highest integer which is lower than the input value. This can be easily understood by some examples.
select floor(5.89) => 5
select floor(5.22) =>5
select floor(-5.89) =>-6
select floor(-5.12) =>-6
As you can see in above command gives highest integer which is lower than the input value.
We will apply our floor command to our student table. We will take average ( avg ) value of all marks secured by students and to that we will apply floor command. Let us first try without floor.