PL/SQL stands for Procedural Language extension of SQL. PL/SQL is a combination of SQL along with the procedural features of programming languages. It was developed by Oracle Corporation in the early ...

/* An object type can have several methods. These can be member methods (instance methods) or static methods (class methods). An object type with methods must have a separate type body which contains ...

-- You CANNOT use = or != to check for NULL: -- WHERE Age = NULL → always returns nothing (WRONG) -- WHERE Age != NULL → always returns nothing (WRONG) -- You MUST use IS NULL or IS NOT NULL instead. ...

SQL is the most common back end data storage and data processing solution used by Facebook, Twitter, Instagram, Spotify etc. SQL is a crucial language for managing relational databases used by major ...