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Left-outer Join

Mike Harris

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I have two tables containing different information about the same customers. In one table I have all the customers, while in the other I have only the customers who have used some premium services. I wanted to add the services information to the main table, without losing the customers who didn't use the premium services and I used a left-outer join. I expected the resulting table to have the same number of rows as the left table but in reality, there are more and I don't understand why.
Thank you!

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