SQL SELECT Tutorial |¦| SQL Tutorial |¦| SQL for Beginners

Web Reference: Which of these queries is the faster? NOT EXISTS: SELECT ProductID, ProductName FROM Northwind..Products p WHERE NOT EXISTS ( SELECT 1 FROM Northwind..[Order Details] od WHERE p. SQL是一种用于处理数据的语言，就像我们说的汉语、英语一样，有特定的语法结构，让我们灵活地处理数据。 SQL并不难学，首先得理解 S Q L 三个字母分别代表什么。 Structured Query Language，简写为SQL，意思是结构化查询语言。也就是说SQL是用来查询数据用的，通过代码指令来实现个性化的数据抽取 ... 了解SQL的大致情况后，我们再来看看如何学？ SQL是所有数据库查询的语言，sql由于本身结构化的特点，非常容易入手。 针对不同的数据库，如hivesql、mysql、sqlserver、oracle等，sql语法会有所不同，但是总体上大同小异，只是细微处的差别。

YouTube Excerpt: The SELECT statement in SQL is how you fetch data from your database. In this SQL tutorial we give an introduction on how to write a SELECT query. We will cover the SELECT, FROM, WHERE, ORDER BY, and LIMIT statements with many examples. The data used in this video is available as a CSV from Socratica on Github. You can download the data here: https://github.com/socratica/data Our SQL playlist starts here: ↪http://bit.ly/Socratica_SQL Be sure to SUBSCRIBE for more SQL! ↪ http://bit.ly/SocraticaSubscribe You may also enjoy our Python playlist: ↪http://bit.ly/PythonSocratica ♦♦♦♦♦♦♦♦♦♦ Ways to support our channel: ►  Join our Patreon : https://www.patreon.com/socratica ►  Make a one-time PayPal donation: https://www.paypal.me/socratica ►  We also accept Bitcoin @ 1EttYyGwJmpy9bLY2UcmEqMJuBfaZ1HdG9 Thank you! ♦♦♦♦♦♦♦♦♦♦ Connect with us! Facebook: https://www.facebook.com/SocraticaStudios/ Instagram: https://www.instagram.com/SocraticaStudios/ Twitter: https://twitter.com/Socratica ♦♦♦♦♦♦♦♦♦♦ SQL instructor: Ulka Simone Mohanty (@ulkam on Twitter) Written & Produced by Kimberly Hatch Harrison (@khhsocratica) & Michael Harrison (@mlh496) ♦♦♦♦♦♦♦♦♦♦

The SELECT statement in SQL is how you fetch data from your database. In this SQL tutorial we give an introduction on how to write a SELECT query....

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