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Chan - SQL Programming: Learn the Ultimate Coding, Basic Rules of the Structured Query Language for Databases like Microsoft SQL Server (Step-By-Ste Computer Programming for Beginners)

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SQL Programming: Learn the Ultimate Coding, Basic Rules of the Structured Query Language for Databases like Microsoft SQL Server (Step-By-Ste Computer Programming for Beginners)
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Chan / Ben
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2020
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SQL Programming

Learn the Ultimate Coding, Basic Rules of the Structured Query Language for Databases like Microsoft SQL Server (Step-By-Ste Computer Programming for Beginners)

Table of Contents

Introduction

In this book, SQL Programming, you will be introduced to the world of programming where youll be given a tour through all of the important features one needs to be familiar with as a beginner.

When it comes to SQL programming, there is quite a lot that you can learn so you can apply it to your career or utilize it as part of a hobby. No matter what you decide, you can rest assured that the book chapters within will supply you with the necessary information to help you receive a clear understanding of it all.

To start, this book will give you a clear understanding of what SQL programming is with a short historical background, what SQL query types are, and database advantages and disadvantages. We will then finish by discussing the administration of the database and how to attach and detach databases.

From there, we are able to move on to a few of the other parts that are important to some of the work that we can handle inside of this language. We can look at how to create some of the necessary tables, the different tools that are required to get some of this work done, and so much more.

If you are working with a database and trying to utilize that as a way to learn more about your customers, figure out which products are selling the best, or some other process to help you get ahead, you will find that this guidebook, and the work that you can do with SQL, will ensure that you are able to make all of this happen. We are going to take you through all of the steps that you need to make sure that you can get the best results in the process.

When you are ready to learn more about the SQL language and what it can do for you and the work that you can do with some of your databases, without being too difficult of a language to learn more about, make sure to check out this guidebook to help you get started.

Chapter 1: Introduction to SQL

SQL is an interesting option that we are able to work with for some of our needs. SQL, or Structured Query Language, is a programming language that has become standardized in the designation of data management and storage. Because of this, a person with a little know-how can easily manipulate, parse, and create any type of data.

Throughout the years, weve witnessed all of the hype and how many of todays tech businesses are starting to shift their business towards strategies that are data-driven. But what happens when a company becomes data-driven? Well, first and foremost, they will be trying to find ways to store all of the data but being able to have easy access to it at any time.

This is when SQL gets introduced.

With SQL, youll have a popular option due to its easy understandability and fast way of working. The design of SQL is to mirror English in terms of written language and reading. As data is retrieved by way of SQL query, there will be no copying found elsewhere. This is because data is accessed where the stored data is located thus allowing for a speedier process.

1.1 Historical Background And SQL Fundamentals

It wasnt until the 70s that saw the first introduction of SQL by Donald Chamberlin and Raymond Boyce. What they originally created was labeled as SEQUEL and mirrored a paper by Edgar Frank Todd that was published in early 1970. In Todds paper, it was proposed that all of the databases data should be regarded as a relation. This was the theory that was used by Chamberlin and Boyce; thus, SQL was born. According to the book Oracle Quick Guides, it states how SQLs original version was made to retrieve and manipulate stored data located in the original RDMI at IBM which was referred to as the "System R."

Then, as the years went by, SQL was eventually available on the public market. Shortly after this public release, the company known as Relational Software, better known as Oracle today, also offered a commercial version referred to as Oracle V2.

Ever since the ANSI and ISO decided to name SQL as the language standard for all communications of a database that are relational. Although there are many vendors who personalize the language to their own taste, their programs are still based on the approved SQL version adopted by ANSI.

SQL Fundamentals

SQLs proper pronunciation has always been disputable within the programming world. As far as the standard goes, the ANSI recognizes the SQL pronunciation as being "es queue el." Regardless, many programmers prefer to its pronunciation in the slang form of "sequel." However, you can call it by whatever feels good to you.

Although there are many varieties of SQL, the two most popular are used by the Oracle database and the Microsoft SQL Server. Microsoft SQL Server takes advantage of the Transact-SQL while Oracle utilizes its own PL/SQL. Even though these two variations are different, they are both used in conjunction with the SQL standard set by ANSI.

DDL and DML Sub-languages

There are two main sub-languages that SQL is divided into. The first is called DDL, and the other is known as DML. The other option, known as Data Definition Language or DDL, is going to consist of a lot of commands that are best for database and database object creation and destruction. Once youve defined the structure of the database using DDL, then you can utilize the DML (Data Manipulation Language) for the modification, retrieval, and insertion of the data.

Commands of the Data Definition Language

This is going to be a kind of language that has the power to both create and then destroy the database object as well as a database. The commands involved with a DDL are given the same treatment by database specialists as they set up or remove project database phases.

In order to understand the commands better that DDL associates with, there are currently four listed, including their structure and usage.

Create

The create command is used to install a computer database management system (DMS) and be able to manage other types of databases that are independent. For instance, if you want to maintain the contact information of customers in a database for reference later or a database for all of the personnel that you work with, then using the CREATE will allow this to happen.

USE

The use command enables you to choose which database to use as you utilize the DBMS.

Remember to remain conscious of which database you are currently working with so that the data will be manipulated properly by the SQL commands.

ALTER

After youve finished using a database to help you make one of your own tables, it is possible that the definition will need to be changed. You would then use the alter so youll be able to change anything in the tables structure without having to worry about recreating or deleting it.

DROP

The drop command is the last one that makes up the DDL. It permits you to drop or remove complete objects of the database from the DBMS.

You need to make sure that this command is used carefully because you dont want the wrong structures removed permanently by accident. If you plan to have single records dropped, then you can just delete them through the DML.

Data Manipulation Language Commands

We use the Data Manipulation Language (DML) for the retrieval, modification, and insertion of information found in a database. All users utilize the commands routinely during the databases operation.

INSERT

The SQL command insert gets utilized when records are to be added to tables that already exist. If we go back to the example of the personnel info from earlier, think about how HR would add employees that are new to their database system.

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