515318390 by Learn Python & SQL Programming & Arduino Programming
Author:Learn Python & SQL Programming & Arduino Programming
Language: eng
Format: epub
Records: 3 Duplicates: 0 Warnings: 0"
DERVIVED TABLES in MySQL Server
A derived table can be defined as virtual table obtained upon execution of a SELECT statements. It is comparable to temp tables, however, in the SELECT statement it is much easier and quicker to use a derived table than a temp table as it would not entail additional steps to create the temp table.
There is often interchangeable use of the term derived table and subquery. When the FROM clause of a SELECT query uses a stand-alone subquery, it is called as a derived table. For example, the syntax below can be used to create a derived table:
SELECT
col_list
FROM
(SELECT
col_list
FROM
tab_1) dervd_tab_nam;
WHERE dervd_tab_nam.d1 > 1;
A derived table is required to have an alias, which can be referenced in future queries, however, there is no such requirement for a subquery. If there is no alias defined for a derived table, the error message below will be displayed by MySQL:
"Every derived table must have its own alias"
Review the example below of a query that will generate Top six products by sales in 2013 from the order and order detail tables in the MySQL server âsample databaseâ:
Download
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.
API Testing and Development with Postman by Dave Westerveld(3216)
Learning C# by Developing Games with Unity 2020 by Harrison Ferrone(2172)
Software Architecture for Busy Developers by Stéphane Eyskens(1942)
2021 Beginners Guide to Python Programming Language: A Crash Course to Mastering Python in One Hour by Elmer Gary & Elmer Gary(1872)
Machine Learning for Algorithmic Trading by Stefan Jansen(1615)
Hands-On ROS for Robotics Programming by Bernardo Ronquillo Japón(1543)
Delphi GUI Programming with FireMonkey by Andrea Magni(1442)
Game Development Projects with Unreal Engine by Hammad Fozi & Goncalo Marques & David Pereira & Devin Sherry(1369)
Cloud Native with Kubernetes by Alexander Raul(1363)
Software Architecture Patterns for Serverless Systems by John Gilbert(1329)
Datadog Cloud Monitoring Quick Start Guide by Thomas Kurian Theakanath(1312)
Automate It with Zapier by Kelly Goss(1311)
Practical Node-RED Programming by Taiji Hagino(1303)
Practical System Programming for Rust Developers by Prabhu Eshwarla(1299)
Mastering React Test-Driven Development by Daniel Irvine(1282)
Delphi Programming Projects by William Duarte(1263)
Ghidra Software Reverse Engineering for Beginners by A. P. David(1233)
Learn Spring for Android Application Development by S. M. Mohi Us Sunnat(1229)
Developing Multi-Platform Apps with Visual Studio Code by Ovais Mehboob Ahmed Khan & Khusro Habib & Chris Dias(1228)
