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# Creating aggregate entries where no base data exists

I have a table with columns: "name", "date", "hour", "calls" (and other not interesting ones). I need to group...

the results by name, date and hour, summing calls. I also wish to have record, even if in the original table, there aren't such records. For example, if for a certain name1 and date1, I have 2 calls at 9, 4 calls at 11, 5 calls at 12, and so on, I wish to have this result set:

```
"name" "date" "hour" "calls"
name1   date1   9      2
name1   date1   10     0
name1   date1   11     4
name1   date1   12     5
...
```
Is there a solution?

There are several ways we can solve this problem. This time, I found a "helper" table useful. But first, here's our Calls table:

```create table Calls
( Name varchar(10),
CallDate date,
CallHour numeric(2)
)

```
We'll need a table of hours (our helper table):
```create table Hours
( Hour numeric(2) );

begin
insert into Hours values (0);
insert into Hours values (1);
insert into Hours values (2);
insert into Hours values (3);
insert into Hours values (4);
insert into Hours values (5);
insert into Hours values (6);
insert into Hours values (7);
insert into Hours values (8);
insert into Hours values (9);
insert into Hours values (10);
insert into Hours values (11);
insert into Hours values (12);
insert into Hours values (13);
insert into Hours values (14);
insert into Hours values (15);
insert into Hours values (16);
insert into Hours values (17);
insert into Hours values (18);
insert into Hours values (19);
insert into Hours values (20);
insert into Hours values (21);
insert into Hours values (22);
insert into Hours values (23);
commit;
end;
```
And here's our SQL with the results:
```select Name, CallDate, Hour,
( select count(*) from Calls t
where t.Name = c.Name
and t.CallDate = c.CallDate
and t.CallHour = h.Hour ) "Total Calls"
from (select distinct Name, CallDate from Calls) c,
Hours h

Name    CallDate       Hour   Total Calls
------- -------------- ------ -----------
```

This was last published in November 2002

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