Danger from Nested Views and Common Table Expressions in SQL Server
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Danger from Nested Views and Common Table Expressions in SQL Server
In our SQL performance consulting for many companies, while optimizing their system we frequently find slow queries around CTE or nested views. The reason is profound: if you access the same table more than ONCE, you are probably doing it wrong! Check execution plan - if you see each table accessed only once, you are good. Key lookup can be ...
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