mysql find rows with fractional part of number

Question

Using the MySQL command prompt, I want to SELECT all rows conataining a specific fractional part of number.

I have a field of type FLOAT called priority & I want to find all rows where the priority is X.2 where X can be any whole number.

Is there a way to use the MOD or FLOOR function to extract the ".2" in a query?

I've tried:

SELECT * from table
WHERE priority-FLOOR(priority) = .2 *(note the decimal point before the 2)*

but it returns empty set when I know there are at least 100 rows containing a priority of X.2

Thanks

Answer 1

What about using the LIKE clause in MySQL?

SELECT * FROM table WHERE priority LIKE %.2%

Answer 2

Floating point numbers are notoriously fickle to work with. That is why SQL offers the decimal data type, which is fixed length.

Do what you want with between:

SELECT *
from table
WHERE priority-FLOOR(priority) between 0.15 and 0.25

Consider storing the priority as a decimal instead of a floating point number.

If you have "deeper" priorities, like 1.22 that you are trying to avoid, then do:

WHERE priority-FLOOR(priority) between 0.195 and 0.205

The range can be even narrower, if you need.