The implementation of MySQL rounding

The article mainly describes the actual application of MySQL rounding, as well as in its actual operation worthy of our attention and the actual application of the code description, the following is the main content of the article described in detail, hope that you will have a deeper understanding after browsing.

FLOOR (X)

1. Returns the maximum integer value that is not greater than X.

Mysql> Select FLOOR (1.23);

-> 1

Mysql> Select FLOOR (-1.23);

->-2

Note that the return value is transformed into a bigint!

CEILING (X)

2. Returns the smallest integer value that is not less than X.

Mysql> Select CEILING (1.23);

-> 2

Mysql> Select CEILING (-1.23);

->-1

Note that the return value is transformed into a bigint!

ROUND (X)

3. Returns an integer for the MySQL rounding of the parameter x.

Mysql> Select ROUND (-1.23);

->-1

Mysql> Select ROUND (-1.58);

->-2

Mysql> Select ROUND (1.58);

-> 2

Note that the return value is transformed into a bigint!

ROUND (X,D)

4. Returns the rounding of the parameter x with a number D as a decimal. If D is 0, the result will not have a decimal point or fractional part.

Mysql> Select ROUND (1.298, 1);

-> 1.3

Mysql> Select ROUND (1.298, 0);

-> 1

Note that the return value is transformed into a bigint!