Hello,
I need help with the an advanced SQL JOIN. I think that I can get this
accomplished with a LEFT JOIN... perhaps some of you may be able to offer
guidance in this... I appreciate any suggestions you may have.
Consider the following SQL statement:
SELECT customerid, count(disctint count1) AS "TODAYS_USERS",
count(distinct count2) AS "LAST 7 DAYS" ,
count(distinct count3) AS "LAST 30 DAYS" FROM
(SELECT distinct case when modified >= '2010-02-11' then modelnumber else null
end as count1,
case when modified >= '2010-02-04' then modelnumber else null end as count2,
case when modified >= '2010-01-11' then modelnumber else null end as count3,
customerid
FROM sales WHERE modelnumber LIKE 'GH77%')
AS results GROUP BY results.customerid
Now, the above SQL query retrieves results that will look something like this:
customerid | TODAYS_USERS | LAST 7 DAYS | LAST 30 DAYS
bigint | bigint | bigint
| bigint
----------------------------------------------------------------------
8699 | 1 | 1
| 1
8700 | 1 |
12 | 17
8701 | 3 |
5 | 19
Now... here is the problem I am having... the above SQL query is retrieving
results from one table: sales
I have another table called customers with a couple of fields (customerid, and
customername are two of the fields).
I want to join on the customerid in both tables to retrieve the customername in
the query.
So I need the results to look something like this:
customerid | customername | TODAYS_USERS
| LAST 7 DAYS | LAST 30 DAYS
bigint | varchar | bigint
| bigint | bigint
--------------------------------------------------------------------------------------------------------------------------------
8699 | Joe Smith | 1
| 1 | 1
8700 | Sara Olson | 1
| 12 | 17
8701 | Mike Jones | 3
| 5 | 19
Can someone show me how to use a JOIN with the above SQL Statement? I need to
bring the customername field into the query from the other table and I have
been having issues writting the query... can this even be done?
Thanks,
Neil
