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This document provides an introduction to SQL and relational database concepts. It explains that SQL is the standard language used to store, manipulate, and query data in relational database management systems. The document also outlines the main SQL commands: DDL for data definition, DML for data manipulation, DCL for data control, and DQL for data queries. It provides examples of key relational database concepts like tables, records, columns and cells. It also defines important SQL constraints and data integrity rules.
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Read and rate my work. Thanks
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Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
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- 2. What is SQL? ▶ Structured Query Language ▶ SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database. ▶ SQL is the standard language for Relation Database System. All relational database management systems like “MySQL, MS Access, Oracle, Sybase, Informix, postgres and SQL Server” use SQL as standard database language.
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- 5. SQL Commands
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- 7. SQL RDBMS Concepts ▶ SQL Constraints: (applied on columns) ▶ NOT NULL Constraint ▶ UNIQUE Constraint ▶ PRIMARY Key ▶ FOREIGN Key ▶ CHECK Constraint ▶ Data Integrity: ▶ Entity Integrity: There are no duplicate rows in a table ▶ Domain Integrity: Enforces valid entries for a given column by restricting the type ▶ Referential Integrity: Rows cannot be deleted which are used by other records ▶ User-Defined Integrity: Enforces some specific business rules
- 8. SQL RDBMS Concepts ▶ Data Types: ▶ Character datatypes: ▶ CHAR ▶ NCHAR ▶ NVARCHAR2 ▶ VARCHAR2 ▶ Numeric datatypes: ▶ NUMBER ▶ BINARY_FLOAT ▶ BINARY_DOUBLE ▶ Date time datatype: ▶ DATE
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