Home › Java › 300+ Java Interview FAQs › Archive for Java FAQs – 13: SQL
Blog Archives

00: 18+ SQL best practices interview Q&As

SQL Best Practices

It is a must to know the order in which the SQL clauses are executed. This is demonstrated with an example below in #5. Have this order of execution visibly pinned and understood.

…

Read more ›


00: 25+ SQL interview questions & answers – beginner

SQL interview Questions & Answers is a must for any developer as all non-trivial applications need to talk to a database with CRUD operations. Q3 – Q15 are very popular with the interviewers.

…

Read more ›


00: 25+ SQL interview questions & answers – intermediate to experienced

This continues 25+ SQL interview questions & answers – beginner Q16. Why do you have CASE statements in SQL? A16. … Read more ›...

Members Only Content
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs

01: 50+ SQL scenarios based interview Q&As on identifying & deleting duplicate records

DB Fiddle - Practice SQL

50+ SQL interview questions and answers to solve real business scenarios. SQL is widely used in building microservices & Big Data projects. Learning SQL syntax is easy, but being able to convert a given business requirement into a query takes lots of practice.

…

Read more ›


02: 50+ SQL scenarios based interview Q&As on joins, CDC and recursive CTE

SQL Recursion - Employees Hierarchy

This extends 50+ SQL scenarios based interview questions answered on identifying & deleting duplicate records. You practice these in SQLs by setting up the data on db-fiddle MySQL V8.0 or...

Members Only Content
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs

15+ SQL optimisation interview questions & answers with scenarios

1) Select fields instead of using SELECT *. The “*” is used as a short hand to query all available data from a table. … Read more ›...

Members Only Content
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs

300+ Java Interview FAQs
Java FAQs - 01: Prepared?
(2)
Java FAQs - 02: Ice Breaker
(5)
Java FAQs - 03: Core Java
(15)
Java FAQs - 04: OOP & FP
(10)
Java FAQs - 05: JEE
(12)
Java FAQs - 06: Spring
(8)
Java FAQs - 07: Hibernate
(4)
Java FAQs - 08: Web Services
(6)
Java FAQs - 09: Microservices
(12)
Java FAQs - 10: Messaging
(3)
Java FAQs - 11: Architecture
(5)
Java FAQs - 12: RDBMS
(2)
Java FAQs - 13: SQL
(6)
Java FAQs - 14: Code Quality
(4)
Java FAQs - 15: Key Areas
(15)
Java FAQs - 16: UML
(1)
Java FAQs - 17: GIT
(4)
Java FAQs - 18: Unix
(3)
Java FAQs - 19: DevOps (CI/CD)
(9)
Java FAQs - 20: AWS (Cloud)
(5)
Java FAQs - 21: Maven
(1)
Java FAQs - 22: Regex
(2)
Java FAQs - 23: JSON & XML
(3)
Java FAQs - 24: JMeter
(2)
16+ Java Key Areas
Key Area - Going places
(2)
Key Area - Ice Breaker
(6)
Key Area - Design Concepts
(39)
Key Area - Judging Experience
(23)
Key Area - Best Practices
(6)
Key Area - Concurrency Management
(6)
Key Area - Low Latency
(10)
Key Area - CI/CD & DevOps
(13)
Key Area - Debugging
Key Area - Debug Hibernate
(3)
Key Area - Debug Java
(11)
Key Area - Debug JEE
(5)
Key Area - Debug Maven
(1)
Key Area - Debug Spark
(4)
Key Area - Debug Spring
(2)
Key Area - Design Patterns
Key Area - GoF Design
(10)
Key Area - JEE Design
(3)
Key Area - Microservices patterns
(5)
Key Area - Exception Handling
(4)
Key Area - Memory Management
(9)
Key Area - Performance
(13)
Key Area - Scalability
(3)
Key Area - SDLC
(7)
Key Area - Security
(18)
Key Area - Productivity Tools
(23)
Key Area - Transaction Management
(6)
Key Area - QoS & SLAs
(8)
300+ Core Java Interview Q&As
Core Java - Overview
(7)
Core Java - Data types
(9)
Core Java - Constructors
(1)
Core Java - Reserved Key Words
(2)
Core Java - Classes
(3)
Core Java - Objects
(7)
Core Java - OOP
(10)
Core Java - GC
(2)
Core Java - Generics
(5)
Core Java - FP
(14)
Core Java - OOP to FP
(9)
Core Java - I/O
(8)
Core Java - Multithreading
(15)
Core Java - Data Structures
(5)
Core Java - Annotations
(2)
Core Java - AOP
(1)
Core Java - Other
(4)
Core Java - Collection API
(13)
Core Java - Differences X & Y
(5)
Core Java - Event Driven
(2)
Core Java - Exceptions
(1)
Core Java - Java 7
(2)
Core Java - Java 8
(24)
Core Java - Java 9 to 20
(7)
Core Java - JVM
(7)
Core Java - Reactive Program
(3)
Core Java - Swing & AWT
(2)
Core Java - Understanding
(4)
300+ Enterprise Java Interview Q&As
JEE - Overview
(2)
JEE - Web basics
(10)
JEE - Web Services
(11)
JEE - JPA
(2)
JEE - JTA
(1)
Key Area - JEE - API Design
(2)
JEE - JDBC
(5)
JEE - Microservices
(8)
JEE - JMS
(5)
JEE - JMX
(3)
JEE - JNDI and LDAP
(2)
JEE - JSF
(2)
JEE - Other
(3)
150+ Spring & Hibernate Interview FAQs
Framework - Hibernate Q&As
(13)
Framework - Spring Core
(5)
Framework - Spring MVC
(7)
Framework - Spring Cloud
(1)
Framework - Spring boot
(2)
Framework - Spring IO
(1)
Framework - Spring Config
(5)
150+ Java Architect interview FAQs
Architecture - Patterns
(10)
Architecture - How to
(12)
Architecture - AWS
(8)
Architecture - Azure
(6)
Architecture - Distributed
(8)
Architecture - Microservices
(11)
Architecture - Networking
(6)
Architecture - QoS
(1)
Architecture - ERD
(1)
Architecture - ETL
(2)
Architecture - Low Latency
(6)
Architecture - UML
(1)
150+ Companion Tech Interview Q&As
Tech - SQL Interview Q&As
(36)
Tech - Unix interview Q&As
(25)
Tech - Git interview Q&As
(8)
Tech - JavaScript Q&As
(6)
Tech - Regex Interview Q&As
(3)
Tech - XML Interview Q&As
(2)
Tech - JSON interview Q&As
(2)
Tech - Maven interview Q&As
(3)
Tech - NoSQL Interview Q&As
(3)
Tech - Groovy interview Q&As
(7)
Tech - JMeter interview Q&As
(2)
Tech - Domain Knowledge Q&As
(3)
Tech - FIX interview Q&As
(2)
Tech - YAML interview Q&As
(4)
Tech - XSD Interview Q&As
(2)
Tech - JavaScript - Angular JS
(3)
Tech - Networking interview Q&As
(5)
Tech - AWS Cloud
(10)
Tech - Azure Cloud
(4)
Tech - Docker & Kubernetes
(7)
150+ Java code quality interview Q&As
Code Quality - Automation
(1)
Code Quality - Code Coverage
(2)
Code Quality - FAQs 🔥
(7)
Code Quality - Profiling
(3)
Code Quality - Performance Test
(2)
Code Quality - Unit Testing
Code Quality - BDD
(4)
Code Quality - JMockit
(15)
Code Quality - Mockito
(4)
Code Quality - Unit Testing FAQs
(3)
Code Quality – Testing DAOs
(4)
Code Quality – JUnit, Mockito & Spring
(6)
Code Quality – JUnit Web
(2)
Code Quality - Spring TXN
(2)
150+ Java coding interview Q&As
Coding - Can you write code?
(22)
Coding - Complete the code
(13)
Coding - Converting from A to B
(6)
Coding - Designing your classes
(9)
Coding - Data Structures
Coding - Arrays
(2)
Coding - Big O notation
(2)
Coding - Graph Structure
(2)
Coding - LinkedList Structure
(2)
Coding - Map Structure
(1)
Coding - Pointer Algorithms
(3)
Coding - Queue Structure
(1)
Coding - Searching Algo
(1)
Coding - Sorting Algo
(4)
Coding - Stack Structure
(1)
Coding - Tree structure
(14)
Coding - Data Which & Why
(2)
Coding - Passing the unit tests
(5)
Coding - What is wrong?
(10)
Coding - Home Assignments
(6)
Coding - Written Test Core Java
(4)
Coding - Written Test JEE
(1)
Tutorials - Big Data
TUT - ⏯ Starting Big Data
TUT - Starting Spark & Scala
TUT - Starting with Python
TUT - Kafka
TUT - Pig
TUT - Apache Storm
TUT - Spark Scala on Zeppelin
TUT - Cloudera
TUT - Cloudera on Docker
TUT - File Formats
TUT - Spark on Docker
TUT - Flume
TUT - Hadoop (HDFS)
TUT - HBase (NoSQL)
TUT - Hive (SQL)
TUT - Hadoop & Spark
TUT - MapReduce
TUT - Spark and Scala
TUT - Spark & Java
TUT - Apache Kafka
TUT - Hadoop
TUT - PySpark on Databricks
TUT - Zookeeper
Tutorials - Enterprise Java
TUT - ⏯ Starting with Java
TUT - Diagnosis
TUT - Akka
TUT - Akka Scala
TUT - Akka Java
TUT - AWS EC2
TUT - CI/CD Jenkins
TUT - Core Java
TUT - Debugging
TUT - Java 8
TUT - JSON and Java
TUT - Java Beginner
TUT - XML and Java
TUT - CSV and Java
TUT - Docker
TUT - JEE
TUT - Web & Web Services
TUT - REST Client
TUT - JSF
TUT - JDBC
TUT - FIX and Java
TUT - JAXB
TUT - JMX
TUT - JPA
TUT - MySQL
TUT - Scala
TUT - Scala Actors
TUT - Spring & Hibernate
TUT - Hibernate
TUT - Spring Basics
TUT - Spring batch
TUT - Hibernate & Spring
TUT - Spring Boot
TUT - Spring IO
TUT - Spring ORM
TUT - Spring other
TUT - Spring OXM
TUT - Spring Cloud
TUT - Tools
TUT - JMeter
TUT - Maven
TUT - Maven Assembly
TUT - Maven Profiles
TUT - Productivity Tools
TUT - Apache Kafka
TUT - Kubernetes
TUT - ⏯ Videos
TUT - ⏯ Starting with Java
TUT - ⏯ Spring Core
TUT - ⏯ Spring MVC
TUT - ⏯ JDBC, Hibernate
TUT - ⏯ Spring Boot
TUT - ⏯ Angular with Spring
TUT - ⏯ Q&As
TUT - Other
TUT - SQL
TUT - Drools
TUT - Apache POI
TUT - DOS
TUT - Dozer
TUT - ESB
TUT - Groovy
TUT - Jasper Reports
TUT - Logging and auditing
TUT - Metrics
TUT - Orika Mapping
TUT - Pentaho Kettle ETL
TUT - Unix
TUT - Webspeher MQ
TUT - YAML
Answers are detailed to be useful beyond job interviews. A few Q&As each day will make a huge difference in 3 to 24 months to go places depending on your experience.
Top