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7
votes
2answers
14k views

Outer Apply vs Left Join Performance

I am Using SQL SERVER 2008 R2 I just came across APPLY in SQL and loved how it solves query problems for so many cases, Many of the tables I was using 2 left join to get the result, I was able to ...
3
votes
3answers
2k views

No advantage of using Cross Apply or CTE over inline sub-query

I came across a query like this: SELECT (SELECT COUNT(1) FROM Orders o WHERE i.ItemId = o.ItemId) [C] FROM Items i I changed it to following ;WITH cte_count AS ( SELECT COUNT(1) c, OrderId ...
0
votes
3answers
125 views

How to convert query results into groups of common results

I have a query that returns results like this: MyValue MyGroup _______________|_______________ 56 | I _______________|_______________ 12 | I ...