SQL Server many-to-many design recommendation
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by Jean-Philippe Brabant
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Published on 2010-05-09T20:14:45Z
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I have a SQL Server database with two table : Users and Achievements. My users can have multiple achievements so it a many-to-many relation.
At school we learned to create an associative table for that sort of relation. That mean creating a table with a UserID and an AchivementID. But if I have 500 users and 50 achievements that could lead to 25 000 row.
As an alternative, I could add a binary field to my Users table. For example, if that field contained 10010 that would mean that this user unlocked the first and the fourth achievements.
Is their other way ? And which one should I use.
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