我已在sql server中创建了表：

create table tblVehicleRegistration (
    vehicleid int identity(1,1) primary key, 
    registrationNumber varchar(5),
    registrationDate date,
    userId int
)

并执行如下查询：

select UserId from tblVehicleRegistration
where registrationNumber = 20012
and registrationDate > '2016-01-01'

奇怪的是 registrationNumber 是 varchar 数据类型和20012是 numeric ，但执行查询。这样写的查询错了吗？实际上这是70-761考试的试题，我需要知道你的意见。这些呢：

select UserId from tblVehicleRegistration
where cast(registrationNumber as int) = 20012
and registrationDate > '2016-01-01'
select UserId from tblVehicleRegistration
where registrationNumber = '20012'
and registrationDate > '2016-01-01'