如何在MySQL中将十进制转换为float

Question

SELECT
    llac.name,
    l.Rate,
    ROUND(llac.loan__Interest_Rate__c, 2) 
FROM cl_import.loan__Loan_Account__c llac 
JOIN decision.loan l
    ON llac.id=l.sf_loan_id
WHERE
    (l.Rate) != llac.loan__Interest_Rate__c;

llac.loan__Interest_Rate__c是一个小数，我想将其转换为float。