OK.. I'm trying to write a query which combines data from two tables. (I'm pretty novice at SQL Queries, so bear with me!) However, I want to exclude duplicate data (based on just one column -- an address field). Basically, I want to only have one result per address. The entire row won't be unique, however, because one or more fields will be different.
Here's the query I have:
tblSourceHistory.source FROM tblEmailClub
INNER JOIN tblSourceHistory
ON tblEmailClub.emailclub_id = tblSourceHistory.emailclub_id
WHERE tblSourceHistory.dateReg BETWEEN '3/1/2009' and '4/1/2009'
AND tblSourceHistory.source LIKE '%family.asp%'
ORDER BY tblSourceHistory.datereg asc
The field I want to be unique is "tblEmailClub.address1". For instance, Person A enters data in my form twice (because they think they'll get two coupons), but "address1" is the same, but one or more other fields are unique, so a DISTINCT won't work because the entire row is not a duplicate.
On a related note, I had this query, which works great for pulling unique records (based on address1) from just my tblEmailClub, but I can't figure out how to combine it with my INNER JOIN above:
FROM tblemailclub t
JOIN (SELECT address1, emailclub_id = MIN(emailclub_id)
GROUP BY address1) AS t1 ON t.emailclub_id = t1.emailclub_id
where source like '%family.asp%'
and datereg between '1/1/2008' and '1/24/2008'
order by datereg asc