Sql Server Part6- (Common Table Expressions)

SQL Server Common table expression in full detail including recursive .

What you'll learn

Students will learn how to write and use Common Table Expressions (CTEs) to simplify complex SQL queries.

They will understand the syntax, purpose, and advantages of CTEs over subqueries and temp tables.

The course covers both non-recursive and recursive CTEs with practical use cases.

Students will gain hands-on experience using CTEs in SELECT, INSERT, UPDATE, and DELETE operations.

Requirements

If you have watched all previous Parts, you are good to go. This part6 is in continuation to the part5 however topic discussed in this is totally a new.

Description

Dear learner, If you have watched Part5 ,then you are ready to take your SQL to a new level. We are discussing here Common table expressions which are adorable, easy and make complex task very very easy. Introduction to Common Table Expressions – what they are and why they are used and how we need to break the scenarios into seperate sections.Why we need them and are they same as derived tables. Syntax and structure of a basic CTE using the WITH clause How CTEs differ from subqueries, temporary tables, and views Real-world use cases where CTEs simplify complex queries Writing simple CTEs to filter and transform data Using multiple CTEs in a single query – comma-separated definitions How to use CTEs in SELECT, INSERT, UPDATE, and DELETE operations Performance tips and when not to use CTEs Understanding recursion and why it’s needed in data structures like hierarchies Building recursive CTEs with an anchor query and recursive part Using OPTION (MAXRECURSION) to control recursion limits Solving practical problems like manager-employee hierarchies using recursive CTEs How to join CTEs with other tables and filter results effectively Nesting and reusing CTEs for better query organization Hands-on exercises with interview-style questions based on CTE logic

Overview

Section 1: Introduction

Lecture 1 Common Table Expression - CTE

Lecture 2 CTE with two tables

Lecture 3 CTE :Employee with highest score

Lecture 4 Order in Last 30 days

Lecture 5 Recursive CTE - Loops

Lecture 6 File Locations using Recursive CTE

Lecture 7 Recursion 1000

Students or professionals preparing for SQL interviews or data-related job roles.,Anyone who wants to understand how databases, tables, schemas, and queries work.,Students who have completed Part 5 and are ready to explore SQL Joins in depth.