oracle数据库2个数的最小值的函数

create or replace   
FUNCTION "MIN_TWO" (paramone IN NUMBER,paramtwo IN NUMBER) RETURN NUMBER     
IS   
min_param NUMBER(18,2);   
  
BEGIN   
  
    IF paramone>0 AND paramtwo>0 THEN   
  
        IF paramone>=paramtwo THEN   
  
            min_param:=paramtwo;   
  
        ELSE   
  
            min_param:=paramone;   
  
        END IF;   
  
    ELSE   
  
        min_param:=0;   
  
    END IF;   
  
RETURN min_param;   
  
END MIN_TWO;