SQL -- Adding a constraint to a results row in an existing query - sql

Question

The following query gives me a one row result
Select Sum(Actions) From
(
Select
Count(t.Create_Dtime) As Actions
From Player_Tapjoy T
Inner Join Player_Source S
On (T.Player_Id = S.Player_Id)
Inner Join Feature_Group_Xref F
On (S.Group_Id=F.Group_Id
And F.Feature_Name ='Try BC')
Where Trunc(t.Create_Dtime) = To_Date('2012-sep-17','yyyy-mon-dd')
Union All
Select
Count(a.Create_Dtime) As Actions
From Player_Aux_Pt A
Inner Join Player_Source S
On (A.Player_Id = S.Player_Id)
Inner Join Feature_Group_Xref F
On (S.Group_Id=F.Group_Id
and f.feature_name = 'TryBC')
Where A.Site = 'AppCircle'
And Trunc(A.Create_Dtime) = To_Date('2012-sep-17','yyyy-mon-dd')
)
I now want to add in a constraint to the result where: only users that have created an account before Sep 12,2012.
In my database language: only users that have a trunc(create_dtime) < To_Date('2012-sep-12','yyyy-mon-dd') . This trunc(create_dtime) date comes from the player table.
Could I map this player table to the current table by using another inner join?

Answer 1

Your requirement isn't completely clear and obviously I have had to guess about your data model. I'm assuming the Player table has one row per Player_Id i.e. it is the primary key end of foreign key relationships to the tables you're querying.
I have changed the inner query so it just returns a set of rows rather than aggregations. Then I join the inline view (aliased q) with the Player table and use a COUNT() rather a SUM() to get the figure.
Select count(Player_Id) From
(
Select
T.Player_Id
From Player_Tapjoy T
Inner Join Player_Source S
On (T.Player_Id = S.Player_Id)
Inner Join Feature_Group_Xref F
On (S.Group_Id=F.Group_Id
And F.Feature_Name ='Try BC')
Where Trunc(t.Create_Dtime) = To_Date('2012-sep-17','yyyy-mon-dd')
Union All
Select
A.Player_Id
From Player_Aux_Pt A
Inner Join Player_Source S
On (A.Player_Id = S.Player_Id)
Inner Join Feature_Group_Xref F
On (S.Group_Id=F.Group_Id
and f.feature_name = 'TryBC')
Where A.Site = 'AppCircle'
And Trunc(A.Create_Dtime) = To_Date('2012-sep-17','yyyy-mon-dd')
) q
join player p
on (p.Player_Id = q.Player_Id)
where Trunc(p.Create_Dtime) < To_Date('2012-sep-12','yyyy-mon-dd')
This may not be the exact result you need, for the reasons I gave at the top, but it should point you in the right directon.