Re: [SQL] JOIN

On 6/5/07, Oliveiros Cristina <oliveiros(dot)cristina(at)gmail(dot)com> wrote:
>
> Hey, Loredana.

Hi Oliveiros! Nice to "see" you again!

Please advice me,
> you need to sum for a certain pair (Theme, receiver) the number that
> appears on count for every record whose date is in dates column, is this
> correct?

Yap.

But in what record's dates column? On all of them? Or just the dates column
> of the records that have that (Theme , Receiver) ?
>
> Suppose I have
> 3| CRIS | rec1 | date1 | (date1,date2)
> 3| CRIS | rec1 | date2 | (date1,date3)
>
> What would be your intended sum?
> 3 ? 6 ?

3

date2 is not on dates column for that record, but it is on the first...
>
> Could you please show me an example of what would be the correct output
> for ex for ,
> CRIS | +40741775622 ?
> And For
> LIA | +40741775621 ?

Let's take a look at the following data:

count | theme | receiver | date
| dates 2 | LIA | +40741775621 | 2007-06-02 00:00:00+00 |
{2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07}
|
1 | LIA | +40741775621 | 2007-06-04 00:00:00+00 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09}
|
3 | CRIS | +40741775622 | 2007-06-01 00:00:00+00 |
{2007-06-01,2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07}
|
1 | CRIS | +40741775622 | 2007-06-04 00:00:00+00 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09,2007-06-10}
|
2 | LIA | +40741775621 | 2007-06-03 00:00:00+00 |
{2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08}
|
1 | CRIS | +40741775622 | 2007-06-04 00:00:00+00 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09,2007-06-10}
|
1 | CRIS | +40741775622 | 2007-06-03 00:00:00+00 |
{2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09}
|
1 | CRIS | +40741775622 | 2007-06-04 00:00:00+00 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09,2007-06-10}
|
4 | LIA | +40741775621 | 2007-06-01 00:00:00+00 |
{2007-06-01,2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06}
|
1 | LIA | +40741775621 | 2007-06-04 00:00:00+00 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09}
|
1 | CRIS | +40741775622 | 2007-06-02 00:00:00+00 |
{2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08}
|

We can see that for LIA if we sum the count per day we have the following:
theme date count
LIA 2007-06-01 00:00:00+00 4
LIA 2007-06-02 00:00:00+00 2
LIA 2007-06-03 00:00:00+00 2
LIA 2007-06-04 00:00:00+00 2

Also for CRIS:

theme date count
CRIS 2007-06-01 00:00:00+00 3
CRIS 2007-06-02 00:00:00+00 1
CRIS 2007-06-03 00:00:00+00 1
CRIS 2007-06-04 00:00:00+00 3

With the following query
SELECT SUM(B.count),
A.theme,
A.receiver,
A.dates
FROM view_sent_messages A
INNER JOIN view_sent_messages B
ON A.theme=B.theme
AND A.receiver=B.receiver
AND B.date=ANY (A.dates)
GROUP BY A.theme,A.receiver, A.dates;

I obtain the following result:

sum | theme | receiver | dates

-----+----------+---------------------+--------------------------------------------------------------------------------
8 | CRIS | +40741775622 |
{2007-06-01,2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07}
5 | CRIS | +40741775622 |
{2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08}
4 | CRIS | +40741775622 |
{2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09}
9 | CRIS | +40741775622 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09,2007-06-10}
10 | LIA | +40741775621 |
{2007-06-01,2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06}
6 | LIA | +40741775621 |
{2007-06-02,2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07}
4 | LIA | +40741775621 |
{2007-06-03,2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08}
4 | LIA | +40741775621 |
{2007-06-04,2007-06-05,2007-06-06,2007-06-07,2007-06-08,2007-06-09}

We can see that for example for the first row, the sum 8 it is correctly
calculated because if we sum the count for the days from dates column.
If we take a look at the fourth row we can see that the sum it is not
correct: it should be taken values for the count only for the date
2007-06-04.
The same problem it is at the eigth row.

Best regards,
Loredana