27 Practical SQL Queries to solve Business Problems

Unlock Your Potential with SQL Skills: A Practical Learn-by-Doing Course

Looking to boost your career in IT? SQL (Structured Query Language) is a highly sought-after skill, essential for navigating the world of big data and data-driven applications. From tech giants like Facebook to local banks, proficiency in SQL is invaluable. This course is specifically designed for beginners and offers a hands-on, practical learning experience.

We'll guide you through setting up your own SQL lab, including downloading and installing Microsoft SQL Server and the sample Northwind database. The core of this course involves solving 27 real-world business problems by crafting effective SQL queries. You'll learn to interrogate the database and extract actionable insights.

Here's a breakdown of the key SQL skills you'll master:

• Data Retrieval with SELECT: Learn to pull the data you need.
• Using Aliases: Improve query readability and organization.
• Case Expressions: Perform conditional logic within your queries.
• Eliminating Duplicates: Ensure data accuracy and avoid redundancy.
• Filtering Data:
  • Equality Filters: Find specific data matches.
  • Basic Comparisons: Utilize operators like >, <, >=, <=.
  • String Comparisons: Work with text data effectively.
  • Logical Comparisons: Combine conditions using AND, OR, NOT.
  • NULL Comparisons: Handle missing data gracefully.
• Sorting Data:
  • ORDER BY Clause: Arrange results in ascending or descending order.
• Table Joins: Extract data from multiple tables to create comprehensive views.
• UNION Operator: Combine results from multiple SELECT statements.
• Aggregate Functions: Calculate single output values (e.g., SUM, AVG, COUNT).
• GROUP BY Clause: Group related data for analysis.

By the end of this course, you'll have the confidence and skills to effectively interrogate databases and unlock the power of data. Gain a competitive edge in the job market and become a valuable asset in any data-driven organization.