floats

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I am running a query on MySQL:

select * from cars where id =52

It returns the row and I can see that gas mileage is saved as a float
with a value of 23.45.  So I then do a query, select * from cars where
id=52 and gas_mil=23.45 and the query doesn't retun anything.  Why? 
Do I have to cast this as a float?

Thanks!

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