SQL Training and Certification in Warsaw, Poland

SQL training equips individuals with the skills to interact with relational databases using Structured Query Language. The course covers fundamental concepts like querying data, filtering results, and joining tables to extract meaningful insights. Participants learn how to create and modify database schemas, perform data manipulation, and ensure data integrity through constraints and indexing. Advanced topics like subqueries, stored procedures, and transaction management are also explored. By completing SQL training, professionals gain the expertise to efficiently manage and analyze large datasets across various industries.

Introduction to SQL and Basic Queries

• Understanding Databases and SQL:

• Introduction to relational database concepts.

• Overview of SQL and its importance in data management.

• SQL Environment Setup:

• Installing and accessing database tools (e.g., MySQL, PostgreSQL).

• Introduction to database interfaces and SQL editors.

• Basic SQL Queries:

• Writing SELECT statements.

• Filtering data using WHERE clauses.

• Sorting data using ORDER BY.

• Hands-on Exercise

• Data Types and Table Basics:

• Overview of data types in SQL.

• Creating, altering, and dropping tables.

• Working with primary keys and constraints.

• Hands-on Exercise

Intermediate SQL Queries and Data Manipulation

• Working with Joins:

• Understanding INNER, OUTER, LEFT, RIGHT, and CROSS joins.

• Combining data from multiple tables.

• Hands-on Exercise

• Aggregation and Grouping:

• Using aggregate functions like COUNT, SUM, AVG, MIN, and MAX.

• Grouping data with GROUP BY.

• Filtering groups with HAVING.

• Hands-on Exercise

• Data Manipulation:

• Inserting, updating, and deleting data in tables.

• Using transactions and rollback for data safety.

• Hands-on Exercise

Advanced SQL Techniques

• Subqueries and Nested Queries:

• Writing subqueries in SELECT, FROM, and WHERE clauses.

• Correlated subqueries for advanced data retrieval.

• Hands-on Exercise

• Views and Indexes:

• Creating and managing views.

• Benefits and use cases for indexes.

• Best practices for using views and indexes.

• Hands-on Exercise

• Functions and Stored Procedures:

• Using built-in SQL functions for data transformation.

• Introduction to user-defined functions and procedures.

• Hands-on Exercise

Database Design, Optimization, and Best Practices

• Database Design Fundamentals:

• Understanding normalization (1NF, 2NF, 3NF).

• Designing efficient and scalable database schemas.

• Hands-on Exercise

• Query Optimization Techniques:

• Using EXPLAIN plans for performance analysis.

• Optimizing queries with indexing and query refactoring.

• Handling large datasets efficiently.

• Hands-on Exercise

• Advanced Topics:

• Using common table expressions (CTEs).

• Working with window functions.

• Introduction to database security and role-based access control.

• Hands-on Exercise

• Best Practices and Troubleshooting:

• Common errors and their resolutions.

• Tips for writing clean and maintainable SQL code.