Blog

Subqueries are one of the most important and exam-critical topics in Oracle SQL. They allow you to place a query inside another SQL statement, dramatically expanding what you can do with filtering, comparison, and data manipulation.

Joins are heavily tested in the Oracle SQL 1Z0-071 exam and appear constantly in real production queries. Understanding how each join works, when to use it, and how it affects result sets is critical for both certification success and practical SQL work.

Group functions transform many rows into a single result, making them essential for answering questions such as totals, averages, counts, minimums, maximums, and rankings.

In this section, we cover the most important conditional expressions supported by Oracle SQL, focusing on syntax, behavior, and exam relevant details.

This section focuses on Oracle SQL conversion functions, which are essential for controlling how data moves between numbers, characters, and date or time data types.

Single-row functions are heavily used in real-world SQL queries and appear frequently in certification exam questions. Mastering them will significantly improve your ability to customize query output and solve complex data manipulation problems.

How to filter and limit data in your queries

Now we're already populating, deleting and updating data in tables. And learn about transaction control