Returning Unique Records
Date: April 12, 2006 02:02PM
First let me describe what I am trying to do. I want to join three different tables: customer_ads, receivables, & customers. I want to return every row from the customer_ads table. The customer_ads table will always have a link between the customers table on customer_ads.client_id = customers.customers_id, however there will not always be records that exist in the receivables table, but I still want to return empty values for the receivables fields I select.
Using the following code works fine:
LEFT JOIN receivables ON (customer_ads.client_id = receivables.client_id)
LEFT JOIN customers ON (customer_ads.client_id = customers.customers_id)
customer_ads.client_id = '41' AND customer_ads.start_date BETWEEN '2006-01-01' AND '2006-01-31'
It returns the correct amount of rows, 12.
However when I add receivables.cust_check_num to the SELECT statement as I want to retrieve that value, if it exisit, it returns over 100 rows with multiple copies of the same record.
Can anyone please tell me first why it returns the same records over and over and secondly how do I return only unique records.
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