Скачать или смотреть SQL Inner Join: Joining Data from Two Tables (PostgreSQL Tutorial)

SQL Inner Join: Joining Data from Two Tables (PostgreSQL Tutorial)

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Описание к видео SQL Inner Join: Joining Data from Two Tables (PostgreSQL Tutorial)

This video provides a comprehensive guide to the SQL INNER JOIN statement for combining data from two tables. Learn the syntax, best practices, and how to use the ON clause to specify the join condition. We'll also cover how to add WHERE clause filters to your join queries to retrieve only the data you need with PostgreSQL examples.

Topics Covered:
What is the purpose of the SQL INNER JOIN statement?
What is the syntax of an INNER JOIN with the ON clause?
What is an alias and how to use it in SQL queries?
What are the differences between equi-joins and non-equi-joins?
What is ASCII-style join syntax?
How to use the WHERE clause to filter joined data?
How to join tables with a greater than two tables?
How to relate the join columns correctly.
What are best practices for writing efficient join queries?
How to validate join operations by checking counts?

Timestamps:
0:00 - Introduction to inner joins in SQL
0:05 - Overview of join types: inner join and outer join
0:17 - Example query: joining two tables using ON
0:44 - Using aliases for clarity in join queries
1:11 - Equi-joins and other join conditions
1:35 - Separating join conditions (ON) and filters (WHERE)
1:53 - Joining multiple tables in one query
2:32 - Example: Joining orders and order items tables
3:37 - Validating joins using record counts
5:06 - Applying filters with WHERE for order status
6:20 - Filtering joined results with date conditions
6:53 - Best practices for inner joins and filtering

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