Sql 两个数据之间的情况

嗨，我必须在这种情况下定义一个约束

    [driver_surcharge_to] [tinyint] NULL CONSTRAINT CK_Vehicle_driverSurchargeTo CHECK (
        1 = case driver_surcharge_from
        when null
            case driver_age_to
                when null then 1
                else 0 end
        else
        case driver_age_to
                when null then 0
                when (driver_age_to) between 16 and 99 then 1
                else 0 end
    end),

我已经试着将相同的名称字段放在一起，不管有没有它，我都不会工作。（括号）

我如何声明一个案例来验证两个数字之间的值

谢谢。

您想使用

案例的“条件”形式

：

[driver_surcharge_to] [tinyint] NULL CONSTRAINT CK_Vehicle_driverSurchargeTo CHECK (
    1 = case driver_surcharge_from
    when null
        case driver_age_to
            when null then 1
            else 0 end
    else
    case when driver_age_to is null then 0
         when driver_age_to between 16 and 99 then 1
         else 0 end
end),

不过，我认为以下逻辑要简单一些：

[driver_surcharge_to] [tinyint] NULL CONSTRAINT CK_Vehicle_driverSurchargeTo CHECK (
    (driver_surcharge_from is null and driver_age_to is null) or
    (driver_surcharge_from is not null and driver_age_to between 16 and 99 )
)