where not exists oracle?

Does not exist in Oracle?
Introduction to the Oracle NOT EXISTS operator
SELECT * FROM table_name WHERE NOT EXISTS (subquery); The NOT EXISTS operator returns true if the subquery returns no row. Otherwise, it returns false. Note that the NOT EXISTS operator returns false if the subquery returns any rows with a NULL value.
Full answer in: www.oracletutorial.com
More questions like: Does not exist in Oracle?
Where not exists in SQL?
The SQL NOT EXISTS Operator will act quite opposite to EXISTS Operator. It is used to restrict the number of rows returned by the SELECT Statement. The NOT EXISTS in SQL Server will check the Subquery for rows existence, and if there are no rows then it will return TRUE, otherwise FALSE.
Full answer in: www.tutorialgateway.org
More questions like: Where not exists in SQL?
Where not in VS where not exists?
The most important thing to note about NOT EXISTS and NOT IN is that, unlike EXISTS and IN, they are not equivalent in all cases. Specifically, when NULLs are involved they will return different results. To be totally specific, when the subquery returns even one null, NOT IN will not match any rows. Feb 18, 2010
Full answer in: www.sqlservercentral.com
More questions like: Where not in VS where not exists?
Which is faster not in or not exists in Oracle?
3 Answers. Oracle 's optimizer is able to see that NOT EXISTS, NOT IN and LEFT JOIN / IS NULL are semantically equivalent as long as the list values are declared as NOT NULL. It uses same execution plan for all three methods, and they yield same results in same time. Dec 28, 2011
Full answer in: stackoverflow.com