SQL Query Returning Duplicate Results?

When I have this problem I start commenting out one join at a time (and the associated selected columns) until I find the offending join causing the problem.

Typically when you join on many tables and end up with duplicate rows it is because you are not seeing the entire picture. If you were to do a "select *" to see all of the columns included in the query (instead of returning a subset of columns) and compare the resulting rows you would find that somewhere along the way there is a column that contains different data.

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