SQL Queries 3 - SubQuery

Delving into the essence of SQL subqueries, an indispensable technique in advanced database queries and data analysis. Beginning with the fundamentals, we explore the concept of subqueries, which are queries nested within another SQL query. We'll cover the use of single-row, multiple-row, correlated and scalar subqueries.

To get the initial table data, watch this video; https://youtu.be/FzpFRGIYGMA?si=X8gemiCVEhEasu5s
SQL Joins: https://youtu.be/ruvYR7vBkAg

00:00 - Introduction
01:40 - Single-row Subquery
04:08 - Multiple-row Subquery
05:40 - Correlated Subquery
11:38 - Scalar Subquery

🔗 Download Hemlock: https://docs.hemlockdata.org/docs/Downloads
🔗 Subquery commands TXT file: https://github.com/theallegrarr/package_manager/blob/main/misc/sql_advanced/subquery/subquery%20commands.txt
🔗 More SQL Learning: https://stackbay.org/modules/learn-sql

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Тэги:

#sql #postgresql #postgres #database #hemlock #json_import #database_management_tool #database_query_ide #sql_ide #sql_querying #subquery #subqueries #scalar #correlated #single_row #multiple_row

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