Colleague says to never use an OR statement in SQL, is this true?
Oct 16, 2020 · My colleague now responsible for SQL development says that I should never use an OR statement because it will mess up the query optimizer and ignore table indexes …
sql server - Outer Apply vs Left Join Performance - Database ...
Aug 27, 2014 · 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 …
sql server - Best practice between using LEFT JOIN or NOT EXISTS ...
Nov 14, 2015 · Is there a best practice between using a LEFT JOIN or a NOT EXISTS format? What is benefit to using one over the other? If none, which should be preferred? SELECT * …
How does different forms of EXISTS () affect performance in MS …
Mar 7, 2024 · There's always the "case by case" aspect of a question like this, but in general, is there any performance gain from using the second implementation of EXISTS() over the first …
Improve SQL Performance with LIKE '%ABC%' QUERY
Apr 29, 2015 · The SQL server is Windows 2012 R2 with SQL Server 2014 Std, and has been built following the Azure SQL performance guidelines (i.e. data on a dedicated striped drive).
sql server - Join condition vs. WHERE...does it make a performance ...
Oct 13, 2021 · Can it be detrimental to performance if I add additional conditions in the where clause rather than the join clause; or is this a part which typically gets simplified and handled …
sql server - Is table partitioning improving performance? Is it …
A couple of quotes: "Partitioning can enhance query performance, but there is no guarantee." And, "In summary, partitioning is mostly for improved maintenance, fast loads, fast deletes and …
How to optimize very slow SELECT with LEFT JOINs over big tables
This would turn this index into a covering index for this query, which should improve performance as well. Furthermore adding an index on (attribute_type_id, attribute_value, person_id) (again …
sql server - Performance with IN clause - Database Administrators …
Does indexed data affect query performance? means If I passed value as 1,2,3,4... in ordered form in any IN clause, can it improve query performance? and what happen in case I pass …
sql server - What's better for large changes to a table: DELETE and ...
Nov 17, 2011 · For me it is easier to just delete all the rows and insert new ones, but if this is going to fragment the table and indexes and impact performance then I would prefer to make …