SQL Server DDL & DML Queries - Part4 Advance level

Master essential SQL skills with this comprehensive guide! You'll gain practical experience with frequently asked interview questions and learn to confidently manipulate data.

What You'll Learn:

• Fundamental SQL Concepts: Understand the core difference between DDL (Data Definition Language) and DML (Data Manipulation Language).
• DDL Deep Dive: Learn to define and modify database structures. We'll cover key DDL commands:
  • CREATE: Build new databases, schemas, and tables.
  • DROP: Permanently remove database objects.
  • ALTER: Modify existing database structures.
  • RENAME: Rename database objects, ensuring data integrity.
• DML Mastery: Manipulate data within tables using essential DML commands:
  • SELECT: Retrieve data.
  • INSERT: Add new data.
  • UPDATE: Modify existing data.
  • DELETE: Remove data.
• Database Architecture: Learn how databases organize information:
  • Database: A structured container for schemas, tables, and other objects.
  • Schema: Logical folders within a database for organizing related objects.
  • Table: A collection of rows and columns storing data records. Understand the importance of column names, data types, and constraints like PRIMARY KEY, NOT NULL, and UNIQUE.
• Practical SQL Projects: Apply your knowledge through hands-on projects:
  • Update_SQL_CustomerTable_ShowDiscount: Dynamically update customer discount values.
  • Updating customer order quantities based on recent sales or category data.
• Advanced SQL Techniques:
  • Column Renaming with SP_RENAME: Rename columns without data loss, maintaining backward compatibility.
  • Common SQL Interview Questions: Prepare for job interviews with solutions to frequently asked SQL questions.
    • Finding the 4th highest ID in a table using subqueries or ROW_NUMBER().
    • Retrieving the Nth highest ID with customizable dynamic ranking logic.
    • Identifying employees who logged in consecutively using LAG() or self-joins.
    • Finding customers with at least three consecutive orders, revealing repeat customer behavior.
    • Writing queries to count employees who received more incentives than their managers using joins.

This course provides a solid foundation in SQL, equipping you with the skills to design, manage, and query databases effectively. Boost your career prospects and become proficient in data manipulation!