sql语句的where子句中的if then运算符[重复]

Question

我有一个场景，我需要从可以传递最小生日和最大生日的表中选择员工列表。 所以我需要的是这样的：-

Select all from employees where active=1 and 

if (not @min_birthday is null and @max_birthday is null)
    birthday > @min_birthday


else if (@min_birthday is null and not @max_birthday is null)
    birthday < @max_birthday

else if (not @min_birthday is null and not @max_birthday is null)
    birthday between (@min_birthday and @max_birthday)

有没有办法在一条 sql 语句中完成上述操作？

Answer 1

where   active = 1 
        and birthday between isnull(@min_birthday, birthday) 
                             and isnull(@max_birthday, birthday)