troubleshooting Question

sql server 2012: Understanding DISTINCT

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enrique_aeo asked on
Microsoft SQL Server 2008
6 Comments3 Solutions441 ViewsLast Modified:
hi experts,

I am reading about: Understanding DISTINCT

but I do not understand

1.Removes rows already operated on by WHERE, HAVING, and GROUP BY clauses
2.Some queries may improve performance by filtering out duplicates prior to execution of SELECT clause
Mark Wills
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