Teradata：返回不同列组合的计数

Question

我有一个如下所示的数据集：

5338 300 [False False False  True  True  True]
[[349154   5338    100]
 [349155   5338    100]
 [349156   5338    100]]

4970 400 [False False False False False False False False  True  True  True]
[[349159   4970     50]
 [349160   4970     50]
 [349179   4970     50]
 [349181   4970     50]
 [349192   4970     50]
 [349113   4970     50]
 [349124   4970     50]
 [349135   4970     50]]

5339 150 [False False False  True  True]
[[449124   5339     50]
 [549135   5339     50]
 [649146   5339     50]]

使用这些数据，我想写一个返回这些数据的代码：

SocialSecurityNumber | ProgramEnrollmentStatus | Contact_Preference | 
---------------------------------------------------------------------
920421                   Enrolled                Daytime
870725                   Not Enrolled            Night
630126                   Undecided               Night
630126                   Undecided               Night
920421                   Enrolled                Daytime
910510                   Undecided               Anytime
921115                   Enrolled                Night
921115                   Enrolled                Night
910510                   Undecided               Anytime
950202                   Enrolled                Daytime

Answer 1

这很棘手，因为您必须生成零值的行。使用cross join即可。其余的是left join和group by：

select cp.contact_preference, pes.ProgramEnrollmentStatus,
       count(distinct SocialSecurityNumber)
from (select distinct contact_preference from t) cp cross join
     (select distinct ProgramEnrollmentStatus from t) pes left join
     t
     on t.contact_preference = cp.contact_preference and
        t.ProgramEnrollmentStatus = pes.ProgramEnrollmentStatus
group by cp.contact_preference, pes.ProgramEnrollmentStatus