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Keys, Dates, Time Zones, UUIDs and Schema Design Introduction Traditional Oracle applications were primarily designed for: Single-region deployments On-premise servers Oracle Forms applications Monolithic systems Modern Java applications are different:…
A Practical Guide for Java Backend Developers One of the biggest mistakes made during schema design is choosing inappropriate data types. A poor datatype decision can impact: Storage requirements Query…
Part 1 – Oracle Database Fundamentals, Schema Design and Best Practices Introduction Most Java developers learn Spring Boot, Hibernate, and REST APIs before fully understanding how databases work internally. However,…
Sets 4–6: Window Functions, Query Optimization, Transactions and Real Interview Problems This article continues the Backend Developer SQL series and focuses on the topics typically asked in 3–10 years experienced…
30 SQL, RDBMS and Database Questions from Beginner to Advanced Level Database knowledge is one of the most important skills for backend developers. Whether you work with Oracle, MySQL, PostgreSQL,…
Java 8 introduced one of the most important changes to interfaces: Default methods Static methods inside interfaces Multiple inheritance conflict resolution Functional interfaces Method references Date-Time API Lambda exception handling…
50 OCP-Style Questions for Java 8 Features Java 8 introduced some of the biggest changes in the language: ✅ Lambda Expressions✅ Functional Interfaces✅ Streams API✅ Optional✅ Method References✅ Default Methods✅…
30 Program-Based Questions for Java Developers Most interview failures happen not because candidates don’t know concepts, but because they cannot read and understand code quickly. These assessments focus entirely on:…
SET 6 – Collections Fundamentals Q1. What is the output? List<Integer> list = Arrays.asList(10,20,30); System.out.println(list.get(1)); A. 10B. 20C. 30D. Exception Q2. What is the output? Set<Integer>…
Q1. What is the output? List<Integer> list = Arrays.asList(1,2,3); list.forEach(System.out::print); A. 1 2 3B. 123C. [1,2,3]D. Compilation Error Q2. What is the output? Stream.of(1,2,3,4) …
