Description: Dive into the world of subqueries in SQL Server with this comprehensive tutorial! Whether you're a beginner or a seasoned developer, this video will help you unlock the power of subqueries to optimize database queries, improve performance, and write cleaner code. Learn the fundamentals, explore practical examples, and discover advanced techniques to take your SQL skills to the next level. Don't miss out on valuable tips and best practices that will make you a pro in handling subqueries. Start mastering SQL Server now!
What you'll learn:
* What are subqueries in SQL Server?
* Types of subqueries: correlated and non-correlated .
* How to use subqueries in SELECT, WHERE, and FROM clauses .
* Practical real-world examples .
* Common pitfalls and best practices .
Objectives
After completing this lesson, you should be able to do the following:
•Describe the types of problems that subqueries can solve .
•Define subqueries .
•List the types of subqueries .
•Write single-row and multiple-row subqueries .
In This Video we have covered complete concept on the Below #sqlserver #subquery
1) Single-Row Subquery
Returns a single row with a single column.
2) Multi-Row Subquery
Returns multiple rows with a single column.
3) Correlated Subquery
A subquery that refers to columns of the outer query. It is re-evaluated for each row processed by the main query.
4) Nested Subquery
A subquery within another subquery.
5) Exists Subquery
Used with the EXISTS clause to check for the existence of rows.
6) Scalar Subquery
Returns a single value (scalar value).
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