SQL Server Eng Part4

Description

• Introduction to CTEs – Understand the purpose and syntax of Common Table Expressions in SQL Server.

• 🔄 CTE Syntax Breakdown – Learn how to use the WITH clause to define temporary result sets.

• 📄 CTE vs. Derived Tables – Clear comparison showing how CTEs offer improved readability and reusability over nested subqueries.

• 📈 Using CTEs in Simple SELECT Queries – Build foundational skills using CTEs in basic queries.

• 🔗 CTEs with JOINS – Learn how to join CTEs with other tables for more complex query scenarios.

• 🧠 Code Clarity and Maintenance – Understand how CTEs improve query structure, especially in multi-step logic.

• 🕵️‍♂️ Nested and Chained CTEs – Introduction to multiple CTEs in a single query block for step-by-step transformation.

• 🔍 Debugging Made Easier – How CTEs simplify troubleshooting compared to deeply nested derived tables.

• 🧹 Cleaner Queries – Demonstrate how CTEs make SQL scripts more modular and easier to read.

• 📚 Real-World Use Cases – Practical examples to show where CTEs outperform traditional subqueries.

• Understanding Data Integrity – Learn the importance of enforcing valid, consistent, and accurate data in relational databases.

• 🔒 Types of Constraints Explained – Deep dive into PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK, and DEFAULT constraints.

• 🏗️ Creating Constraints – Syntax and examples for adding constraints during CREATE TABLE and using ALTER TABLE.

• 🧯 Dropping Constraints – Learn how to drop constraints temporarily for data correction or maintenance.

• 🔁 Restoring Constraints – Best practices to recreate constraints after temporary removal to preserve data integrity.

• ✏️ Altering Constraints – Modify existing constraints safely using ALTER TABLE and understand limitations.

• 🔄 Parent-Child Table Relationships – Explore how foreign key constraints link related tables and enforce referential integrity.

• 🚫 Effect on DELETE and UPDATE Operations – Understand constraint behavior with CASCADE, SET NULL, and NO ACTION options.

• ⚠️ Insert Violations and Prevention – How constraints prevent invalid INSERT operations and maintain consistency.

• 🔍 Practical Scenarios – Real-world examples showing how constraint violations can break integrity—and how to fix them.

• 🛠️ Best Practices for Data Integrity – Tips for managing constraints in production environments without breaking relationships.