SQL Lessons
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Structured Query Language (abbreviated ” SQL” ) is a standard query language used for working with relational databases. SQL is used to create and delete databases, create and delete tables within a database, read, insert, update, and delete data from tables, and perform many other database operations.
Why learn SQL?
SQL is used for communication between relational databases. It is used in DBMSs such as MySQL, PostgreSQL, Oracle, SQL Server, and many others. Knowledge of SQL is commonly required for many job openings for programmers, business analysts, big data specialists, and others.
In this tutorial, we’ll go over the basics of SQL, as well as look at the differences between commands in MySQL, Oracle, SQL Server, PostgreSQL, and other widely used DBMSs.
Introduction
SELECT in SQL
AND, OR, and NOT operators in SQL
LIMIT, TOP a,nd FETCH FIRST in SQL
Working with NULL Values in SQL
MAX() and MIN() functions in SQL
SUM() and AVG() functions in SQL
JOIN in SQL
Databases and Tables in SQL
INSERT, UPDATE, and DELETE in SQL
Limitations in SQL
Additional SQL Topics
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