SQL NOT IN Vs NOT EXISTS (Which one to use?) YouTube

Not In And Not Exists. 5 Ways to implement NOT EXISTS in PostgreSQL EverSQL This is why NOT IN can be unpredictable and hence advised to avoid using if there is the NULL value or there is the possibility of having a NULL value in the future. Explanation: As we can see from the above image, we didn't need to specially handle NULL values in the case of NOT EXISTS statement

Explanation: As we can see from the above image, we didn't need to specially handle NULL values in the case of NOT EXISTS statement Columns that will never contain NULL values should be defined as NOT NULL so that SQL knows there will never be NULL values in them and so that it doesn't have to produce complex plans to handle potential nulls.

5 Snowflake Query Tricks You Aren’t Using but Should Be by Anthony Li Towards Data Science

If the any subquery do not results any values or return 0 then only the parent query will execute Not an issue in this specific case, just something to keep in mind - just like UNION versus UNION ALL That's why the LEFT JOIN / IS NULL query takes 810 ms, or 3 times as much as the NOT EXISTS / NOT IN query

SQL Server EXISTS and NOT EXISTS. My preference for this pattern is definitely NOT EXISTS: SELECT CustomerID FROM Sales.Customer AS c WHERE NOT EXISTS ( SELECT 1 FROM Sales.SalesOrderHeaderEnlarged WHERE CustomerID = c.CustomerID ); The NOT EXISTS condition in SQL Server is used for excluding events located in a subquery from the main query

SQL Server EXISTS and NOT EXISTS. Not an issue in this specific case, just something to keep in mind - just like UNION versus UNION ALL In SQL Server, NOT EXISTS and NOT IN predicates are the best way to search for missing values, as long as both columns in question are NOT NULL