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Structured Query Language CheatSheet, Cheat Sheet of Database Management Systems (DBMS)

Vellore Institute of TechnologyDatabase Management Systems (DBMS)

SQL is a standard language for storing, manipulating and retrieving data in databases. It allows end-users to communicate with databases and perform tasks like creating, updating, and deleting databases. Almost every mid to large-sized organization uses SQL, including Facebook, Microsoft, LinkedIn, and Accenture. SQL has many uses and is used in marketing, healthcare, and finance for data and business analytics, development, and data science. In this section, we will take a closer look at what SQL is used for, along with the types of jobs that require employees to know the language.

Typology: Cheat Sheet

2023/2024

Uploaded on 06/21/2024

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SQL FOR EVERYONE THE DEFINITIVE GUIDE EINOTES GALLERY CREATE BY - ATUL KUMAR (LINKEDIN) Table of Contents . Introduction to SQL . Basic SQL Syntax . Querying Data . Filtering and Sorting Data . Joining Tables . Aggregation Functions . Subqueries and Nested Queries . Modifying Database Information OMAN ODOAGAHEAWANDYD FE . Advanced SQL Techniques 10. Optimization and Performance Tuning 1. Introduction to SQL SQL is a standard language designed for managing data in relational databases. It's commonly used to query, insert, update, and modify data. Most RDBMS (Relational Database Management System) like MySQL, SQLite, Oracle, and PostgreSQL use SQL. As a data analyst, you'll often work with large volumes of data stored in these databases. SQL becomes an essential tool to retrieve, manipulate, and analyze this data. 1.1 RDBMS and Tables In SQL, data is stored in tables, just like an Excel spreadsheet. A table is made up of rows (records) and columns (fields). Here's an example of a table, Employees: