SQL Tutorial: Linking Tables with Foreign Keys & Where Clauses

In today's tutorial, we are diving deep into two fundamental SQL concepts: Foreign Keys and Clauses. You'll learn how to create meaningful links between tables to ensure data integrity and how to use the WHERE clause to filter through your data like a pro. In this video, we cover: ✔ Foreign Keys Explained: How to link one table to another (for example, connecting Employees to Departments). ✔ Data Constraints: Setting default values and ensuring only valid department details are entered. ✔ SQL Clauses: An introduction to filtering, sorting, and organizing your data. ✔ Hands-on Practice: Watch as we build an EmployeeTable from scratch, insert data, and run specific filtering queries using comparison operators (Less Than, Less Than or Equal To, Greater Than or Equal To, and Greater Than). SQL Code used in this video: -- Creating the Employee Table Create table EmployeeTable( Emp_id int Primary Key not null, Name Varchar(30), Designation Varchar(30), Dept Varchar(15), Det_id int, Age int, Salary Decimal, Location Varchar(30), DOJ Date ); -- Filtering Examples SELECT * FROM EmployeeTable WHERE Dept = 'HR'; SELECT * FROM EmployeeTable WHERE Age is 30 or above; SELECT * FROM EmployeeTable WHERE Salary is 65000 or above; Timestamps: 0:00 - Introduction to Foreign Keys 2:15 - Linking Tables (Dep_id Reference) 5:40 - Understanding SQL Clauses 8:10 - Creating the EmployeeTable 12:30 - Inserting Data and Filtering with WHERE 15:45 - Using Comparison Operators for Salary and Age If you found this helpful, don't forget to: ✅ Subscribe for more SQL and Data Analytics tutorials. 👍 Like the video if it helped you understand table relationships. 💬 Comment below: Which SQL concept should we cover next? #SQL #SQLServer #Database #ForeignKey #WhereClause #DataAnalytics #SQLTutorial #LearningSQL #Coding #TechTutorial #MohammadYusuf