SQL：我可以根据值在表行旁边显示注释吗？

比如说，我有一张员工桌 员工编号、开始日期、员工姓名、性别、员工单位 其中单位为1,2,3

我想显示一个附加列，该列不在表中，其注释取决于表中的值

也就是说，如果unit='1'，这意味着他们为巴黎工作，我想展示这一点；若该员工在2016年开始工作，那个么他是一名新员工，我想在下面的信息示例中显示您需要的案例。例如：

/* build a test case */
with test(n, y) as (
    select 1, 2016 from dual union all
    select 2, 2000 from dual
)
/* the query */
select n,
       case
        when n = 1 then 'comment when n=1'
        when n = 2 then 'comment when n=2'
       end
       || ' and ' ||
       case
        when y > 2010 then 'year greater than 2010'
        else 'year <= 2010'
       end as comm
from test;  

给出：

         N COMM
---------- -------------------------------------------
         1 comment when n=1 and year greater than 2010
         2 comment when n=2 and year <= 2010

你需要一个箱子。例如：

/* build a test case */
with test(n, y) as (
    select 1, 2016 from dual union all
    select 2, 2000 from dual
)
/* the query */
select n,
       case
        when n = 1 then 'comment when n=1'
        when n = 2 then 'comment when n=2'
       end
       || ' and ' ||
       case
        when y > 2010 then 'year greater than 2010'
        else 'year <= 2010'
       end as comm
from test;  

给出：

         N COMM
---------- -------------------------------------------
         1 comment when n=1 and year greater than 2010
         2 comment when n=2 and year <= 2010