Advanced SQL Queries Essential for Java Developers Interview

1. Subqueries

Retrieve employees who earn more than the average salary using a subquery in the WHERE clause.

2. Joins

Master different types of joins such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.

3. Aggregate Functions

Know how to use aggregate functions like SUM, AVG, COUNT, MIN, and MAX.

4. Window Functions

Understand how to use window functions for performing calculations across a set of rows.

5. Grouping Sets

Know how to use GROUPING SETS to generate multiple levels of grouping in a single query.

6. Recursive Queries

Understand how to write recursive queries to traverse hierarchical data structures.

7. Database Transactions

Understand the concepts of ACID properties and how to use transactions to ensure data integrity.

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