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PostgreSQL Interview Preparation

500+ questions. Real scenarios. Crack PostgreSQL interviews. Get your dream database job!

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PostgreSQL Interview Preparation

4 Modules

Course Curriculum

4 Modules · 22 Chapters · 22 Topics · 212 Sub-topics

Introduction to PostgreSQL

1 Topics

Introduction to PostgreSQL

6 Sub-topics

What is PostgreSQL and Why Use It

Installing PostgreSQL on Different Platforms

Understanding PostgreSQL Architecture

Connecting to PostgreSQL Database

PostgreSQL Command-Line Tools (psql)

Understanding Databases, Schemas, and Tables

SQL Fundamentals - Data Definition Language (DDL)

1 Topics

SQL Fundamentals - Data Definition Language (DDL)

8 Sub-topics

Creating Databases and Schemas

CREATE TABLE Statement Basics

DROP and TRUNCATE Statements

ALTER TABLE - Adding Columns

ALTER TABLE - Modifying Columns

ALTER TABLE - Dropping Columns

RENAME Operations

Understanding Table Ownership

PostgreSQL Data Types

1 Topics

PostgreSQL Data Types

10 Sub-topics

Numeric Types - INTEGER, BIGINT, DECIMAL

Character Types - VARCHAR, CHAR, TEXT

Boolean Type

Date and Time Types - DATE, TIME, TIMESTAMP

UUID Type and Generation

ENUM Types - Creating Custom Types

Array Data Types

JSON and JSONB Types

Range Types

Choosing the Right Data Type

Basic Data Querying

1 Topics

Basic Data Querying

13 Sub-topics

SELECT Statement Structure

Selecting Specific Columns

Using Column Aliases

WHERE Clause Basics

Comparison Operators

Logical Operators - AND, OR, NOT

IN and NOT IN Operators

BETWEEN Operator

LIKE and ILIKE Pattern Matching

IS NULL and IS NOT NULL

DISTINCT Keyword

ORDER BY Clause - ASC and DESC

LIMIT and OFFSET for Pagination

Working with Multiple Tables - Joins

1 Topics

Working with Multiple Tables - Joins

10 Sub-topics

Understanding Table Relationships

INNER JOIN Basics

LEFT JOIN (LEFT OUTER JOIN)

RIGHT JOIN (RIGHT OUTER JOIN)

FULL OUTER JOIN

CROSS JOIN

Self Joins

Joining Multiple Tables

Using Table Aliases in Joins

Join Performance Considerations

Subqueries

1 Topics

Subqueries

8 Sub-topics

What are Subqueries

Subqueries in WHERE Clause

Subqueries in SELECT Clause

Subqueries in FROM Clause

Correlated Subqueries

EXISTS and NOT EXISTS

ANY and ALL Operators

Subquery Performance Considerations

Aggregate Functions and Grouping

1 Topics

Aggregate Functions and Grouping

10 Sub-topics

COUNT Function

SUM Function

AVG Function

MIN and MAX Functions

GROUP BY Clause Basics

Grouping by Multiple Columns

HAVING Clause

WHERE vs HAVING

Aggregate Functions with DISTINCT

String Aggregation Functions

Data Manipulation Language (DML)

1 Topics

Data Manipulation Language (DML)

10 Sub-topics

INSERT Statement - Single Row

INSERT Statement - Multiple Rows

INSERT with SELECT

UPDATE Statement Basics

UPDATE with Conditions

UPDATE with Joins

DELETE Statement

DELETE with Conditions

RETURNING Clause

UPSERT - INSERT ON CONFLICT

Constraints

1 Topics

Constraints

10 Sub-topics

PRIMARY KEY Constraint

FOREIGN KEY Constraint

UNIQUE Constraint

NOT NULL Constraint

CHECK Constraint

DEFAULT Values

Constraint Naming Conventions

Adding Constraints to Existing Tables

Dropping Constraints

ON DELETE and ON UPDATE Actions

Indexes

1 Topics

Indexes

10 Sub-topics

Understanding Index Basics

Creating B-Tree Indexes

Unique Indexes

Multi-Column Indexes

Partial Indexes

Expression Indexes

EXPLAIN and Query Plans

ANALYZE Command

When to Create Indexes

Index Maintenance Considerations

Views

1 Topics

Views

8 Sub-topics

Creating Simple Views

Views with Joins

Views with Aggregations

Updatable Views

Materialized Views

Refreshing Materialized Views

Dropping and Altering Views

Views vs Tables Performance

User-Defined Functions

1 Topics

User-Defined Functions

12 Sub-topics

Introduction to User-Defined Functions

Creating SQL Functions

Function Parameters and Return Types

RETURNS TABLE Functions

PL/pgSQL Language Basics

Variables in PL/pgSQL

Control Structures - IF/THEN/ELSE

Loops in PL/pgSQL

Exception Handling

Returning Multiple Values

Function Overloading

Dropping and Replacing Functions

Stored Procedures

1 Topics

Stored Procedures

7 Sub-topics

Creating Stored Procedures

Procedures vs Functions

IN, OUT, and INOUT Parameters

Transaction Control in Procedures

CALL Statement

Error Handling in Procedures

Procedure Best Practices

Triggers

1 Topics

Triggers

10 Sub-topics

Introduction to Triggers

BEFORE Triggers

AFTER Triggers

Row-Level Triggers

Statement-Level Triggers

Trigger Functions

NEW and OLD Variables

Conditional Trigger Execution

Trigger Management - Enable/Disable

Trigger Use Cases and Best Practices

Transactions and Concurrency

1 Topics

Transactions and Concurrency

10 Sub-topics

Understanding ACID Properties

BEGIN, COMMIT, and ROLLBACK

Transaction Isolation Levels

Read Committed Isolation

Repeatable Read Isolation

Serializable Isolation

Savepoints

Understanding Locks

Deadlocks and Prevention

Optimistic vs Pessimistic Locking

Common Table Expressions (CTEs)

1 Topics

Common Table Expressions (CTEs)

9 Sub-topics

Introduction to CTEs

Basic CTE Syntax

Multiple CTEs in One Query

Recursive CTEs - Part 1 (Basics)

Recursive CTEs - Part 2 (Hierarchical Data)

Recursive CTEs - Part 3 (Advanced Patterns)

CTEs vs Subqueries

Performance Considerations

Materialized CTEs

Window Functions

1 Topics

Window Functions

12 Sub-topics

Introduction to Window Functions

ROW_NUMBER Function

RANK and DENSE_RANK Functions

NTILE Function

LAG and LEAD Functions

FIRST_VALUE and LAST_VALUE

PARTITION BY Clause

ORDER BY in Window Functions

Window Frame Clauses - ROWS

Window Frame Clauses - RANGE

Aggregate Window Functions

Combining Multiple Window Functions

Database Design and Normalization

1 Topics

Database Design and Normalization

10 Sub-topics

Database Design Principles

Entity Relationship Diagrams

First Normal Form (1NF)

Second Normal Form (2NF)

Third Normal Form (3NF)

Boyce-Codd Normal Form (BCNF)

Denormalization When Appropriate

Designing for Scalability

Schema Naming Conventions

Common Design Patterns

Query Optimization Techniques

1 Topics

Query Optimization Techniques

10 Sub-topics

Understanding Query Execution Plans

Using EXPLAIN ANALYZE

Index Usage Analysis

Query Rewriting for Performance

Avoiding SELECT *

Optimizing Joins

Optimizing Subqueries

Partitioning Strategies

Statistics and ANALYZE

Connection Pooling Concepts

Security for Developers

1 Topics

Security for Developers

10 Sub-topics

Creating Database Users

GRANT and REVOKE Privileges

Role-Based Access Control

Schema-Level Permissions

Row-Level Security (RLS) - Part 1

Row-Level Security (RLS) - Part 2

SQL Injection Prevention

Prepared Statements

Connection Security Best Practices

Encrypting Sensitive Data

Best Practices and Design Patterns

1 Topics

Best Practices and Design Patterns

10 Sub-topics

Code Organization Strategies

Naming Conventions

Comment and Documentation

Version Control for Database Schema

Migration Strategies

Testing Database Code

Avoiding N+1 Query Problems

Batch Processing Techniques

Monitoring and Alerting

Code Review Guidelines

Error Handling and Debugging

1 Topics

Error Handling and Debugging

9 Sub-topics

Understanding PostgreSQL Error Codes

Exception Handling in Functions

RAISE Statements

Logging and Debugging Queries

Common Error Messages

Using pg_stat Statements

Debugging Performance Issues

Transaction Rollback Handling

Constraint Violation Handling

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PostgreSQL Interview Preparation

Certificate of Completion

Course Curriculum

Student Reviews

Frequently Asked Questions

Start Your Journey Today

PostgreSQL Interview Preparation

Certificate of Completion

Course Curriculum

Student Reviews

Frequently Asked Questions

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