Complete MYSQL Basics : Concep

是否想快速准确地学习MYSQL基础？使用我们的应用程序享受学习

SQL is a database computer language designed for the retrieval and management of data in a relational database. SQL stands for Structured Query Language. This tutorial will give you a quick start to SQL. It covers most of the topics required for a basic understanding of SQL and to get a feel of how it works.

Why to Learn SQL?

SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in a relational database.

SQL is the standard language for Relational Database System. All the Relational Database Management Systems (RDMS) like MySQL, MS Access, Oracle, Sybase, Informix, Postgres and SQL Server use SQL as their standard database language.

Also, they are using different dialects, such as −

MS SQL Server using T-SQL,

Oracle using PL/SQL,

MS Access version of SQL is called JET SQL (native format) etc.

Applications of SQL

As mentioned before, SQL is one of the most widely used query language over the databases. I'm going to list few of them here:

Allows users to access data in the relational database management systems.

Allows users to describe the data.

Allows users to define the data in a database and manipulate that data.

Allows to embed within other languages using SQL modules, libraries & pre-compilers.

Allows users to create and drop databases and tables.

Allows users to create view, stored procedure, functions in a database.

Allows users to set permissions on tables, procedures and views.

Audience

This SQL tutorial is prepared for beginners to help them understand the basic as well as the advanced concepts related to SQL languages. This tutorial will give you enough understanding on the various components of SQL along with suitable examples.

Prerequisites

Before you start practicing with various types of examples given in this tutorial, I am assuming that you are already aware about what a database is, especially the RDBMS and what is a computer programming language.

Chapters-

Overview

RDBMS Concepts

Databases

Syntax

Data Types

Operators

Expressions

Create Database

Drop Database

Select Database

Create Table

Drop Table

Insert Query

Select Query

Where Clause

AND & OR Clauses

Update Query

Delete Query

Like Clause

Top Clause

Order By

Group By

Distinct Keyword

Sorting Results

Advanced SQL

Constraints

Using Joins

Unions Clause

NULL Values

Alias Syntax

Indexes

Alter Command

Truncate Table

Using Views

Having Clause

Transactions

Wildcards

Date Functions

Temporary Tables

Clone Tables

Sub Queries

Using Sequences

Handling Duplicates

Injection