Скачать или смотреть The FROM Clause in Table Expressions || Queries in PostgreSQL || PostgreSQL Full Playlist #32

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Master the FROM clause in PostgreSQL! Learn table expressions, joins, subqueries, and more to enhance your SQL queries.

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Description
Understanding the FROM clause is crucial for writing efficient SQL queries in PostgreSQL. In this video, we’ll explore how the FROM clause works within table expressions and why it plays a vital role in retrieving, filtering, and joining data.

🔹 What You’ll Learn in This Video:
✔️ Basics of table expressions in PostgreSQL
✔️ Table inheritance and how it affects queries
✔️ CROSS JOIN, INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
✔️ Using table and column aliases for better readability
✔️ Implementing subqueries within the FROM clause
✔️ Understanding LATERAL subqueries
✔️ Utilizing table functions to enhance data retrieval

🔹 Key Examples Covered:
✅ Creating and querying tables (employees and departments)
✅ Performing various types of joins to combine related data
✅ Using subqueries to simplify complex queries
✅ Writing functions to return sets of rows within the FROM clause

🚀 Why Watch This Video?
Whether you’re a beginner or an advanced PostgreSQL user, mastering the FROM clause will improve your database queries significantly. By the end of this tutorial, you'll be confident in handling table expressions, joins, and subqueries like a pro!

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📌 Chapters Covered:
00:00 - Introduction
01:00 - Basic Table Expression Structure
01:16 - Simple FROM Clause Example
02:05 - Table Inheritance In FROM Clause
03:24 - ONLY FROM Clause In Table Expression
03:55 - CROSS JOINS/Cartesian Product In FROM Clause
05:05 - INNER JOINS In FROM Clause – Combining Related Data
05:55 - OUTER JOINS In FROM Clause
06:15 - LEFT OUTER JOINS In FROM Clause
07:15 - RIGHT OUTER JOINS In FROM Clause
08:12 - FULL OUTER JOINS In FROM Clause
09:06 - Table and Column Aliases for Readability
10:02 - Using Subqueries In FROM Clause
10:50 - LATERAL Subqueries In FROM Clause
11:46 - Table Functions In FROM Clause
12:56 - Conclusion