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Ms sql server left join problem

Posted By:      Posted Date: October 27, 2010    Points: 0   Category :Sql Server

Hi, i have 2 tables(prduction and transact) that contain data for transactional updates per product, stock is calculated by doing sum() on one column in each table that contains the weight and to get the result per product i use group by product. My problem is that if than one value exists in the transact table, the sum(production.plannedtonnage) result is doubled for every record in the transact table. How can i fix this, any help would be greatly appreciated!

select distinct production.product

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