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 ...

Oracle SQL for Beginners | SQL Complete Tutorial for Beginners | SQL Full Course | SQL Tutorial Chapters: ===== 00:00:00 Introduction to Oracle SQL 00:00:56 Oracle database installation - Oracle 11g ...

-- 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. ...

SELECT TO_CHAR(CURRENT_DATE, 'DD/MM/YYYY'); -- → '19/05/2026' SELECT TO_CHAR(CURRENT_DATE, 'DD MON YYYY'); -- → '19 MAY 2026' SELECT TO_CHAR(CURRENT_TIMESTAMP ...

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 ...