SQL Server Statistics Basics
'Distribution statistics are used by SQL Server's Query Optimiser to determine a good execution plan for your SQL query. You don't need to know about them to execute queries, but the better you understand them, the better you can optimise your queries and sort out performance problems. Robert Sheldon once more provides a simple guide.'...
https://www.simple-talk.com/sql/performance/sql-server-statistics-basics/
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