Introduction
Network programs are larger and more flexible.
In many cases, the fundamental scheme of operations is mainly a mix of scripts that handle the command of a database. 
Due to the variety of languages and pre-existing sources, the method to "talk" between one another may usually be challenging and complicated, fortunately for us, the presence of requirements that permit us to do the typical methods by way of a widespread form can make this particular perplexing task even more simple. 
That is what Structured Query Language (SQL) is based on, that typically is only a worldwide common language of interaction within databases.
That is precisely why, the Structured Query Language (SQL) is really a standardized language that allows most people to apply some language e.g. PHP or ASP, in conjunction with any particular database e.g. MySQL, MS Access, SQL Server. 
If you are interested in learning a new coding language, there are a lot of different options that you can choose from, and it really depends on what you are looking for and what you want to do with them.
Some of these languages are good for helping you to create a good website.
Some are good for creating a smartphone application or for working on your own game to share with others.
And then you can also choose a coding language that is like SQL, which are meant to help businesses stay organized and keep track of their information without all the challenges that can come with this.   
Traditionally, many companies would choose to work with the ‘Database Management System,’ or the DBMS to help them to keep organized and to keep track of their customers and their products.
This was the first option that was on the market for this kind of organization, and it does work well.
Some newer methods that have changed the way that companies can sort and hold their information.
Even when it comes to the most basic management system for data that you can choose, you will see that there is a ton more power and security than you would have found in the past.   
Big companies will be responsible for holding onto a lot of data, and some of this data will include personal information about their customers like address, names, and credit card information.
Because of the more complex sort of information that these businesses need to store, a new ‘Relational Database Management System’ has been created to help keep this information safe in a way that the DBMS has not been able to.  
Now, as a business owner, there are some different options that you can pick from when you want to get a good database management system.
Most business owners like to go with SQL because it is one of the best options out there.
The SQL language is easy to use, was designed to work well with businesses, and it will give you all the tools that you need to make sure that your information is safe.
Let’s take some more time to look at this SQL and learn how to make it work for your business.  
How to start coding
SQL is easy to learn, and you won't have a lot of different commands in order to bring up the information that you want.
In this chapter, we are going to spend some time learning some of these commands as well as separating the commands into the six different categories that are the best for them.
These six categories include: 
Data Definition Language
This one is also known as the DDL, and it is one of the aspects that is inside of your SQL program that is in charge of allowing you to generate objects into the database before arranging them the way that you enjoy the best.
For example, this is the aspect of the system that you will use when you would like to make changes, such as adding or deleting objects, out of the table.
The commands that you would be able to use for this including: 
Data Query Language
When you are working in DQL, you are working with what many consider a really powerful aspect of what they are able to do with SQL, especially when you are working on a database system that is considered more modern.
There is just one command that is needed in order to work with the DQL part, and this command is the "Select" command.
You are able to use this command in various ways including using it to run queries when you are inside of a relational database.
If you were interested in getting results that are more detailed, you would need to use the Select command through DQL to make this happen. 
Data Control Language
The DCL is another component of SQL that you should learn to use, and it is the commands that the user works with any time that they want to control who is allowed to get on the database.
If you are dealing with personal information like credit card information, it is a good idea to have some limitations on who can get onto the system and get the information.
This DCL command is used to help generate the objects that are related to who can access the information in the database, including who will be able to distribute the information.
There are a few commands that are helpful when you are working on DCL including: 
Data Administration Commands
When it comes to some of the commands that you can use inside SQL, you can also use them in order to audit or analyze the operation that is inside of the database.
They are also good to assess the performance of the database overall with the help of some of these commands.
If you would like to fix something that is causing issues on the system or you would like to get rid of some of the bugs on the system, these are the commands that you are going to need to work with.
While there are some options that you can choose from with these commands, the two most popular options include: 
One of the things that you need to remember when working with SQL is that data administration and database administration are going to be two different ideas inside the system.
For example, database administration is going to be the part that will manage all your databases, including the different commands that you are setting up in SQL and they will also be more specific to the implementation that is done in SQL.  
Transactional Control Commands
If you are trying to manage and keep track of some of the transactions that are going on with your database with you and the customer, the transactional control commands are the right ones to use.
If you are a company that uses their website in order to sell products online, the transactional control commands are going to help make sure that you can keep all of this inline.
There are several things that you will be able to use these transactional control commands for, including: 
Commit    
This is the command that you will need to use in order to save information that relates to the different transactions that are inside your database.  
Savepoint    
This is the command that you will be able to use in order to generate different points inside the group of transactions.
This is also the one that you can use at the same time as the Rollback Command.  
Rollback    
This command is the one that you will use whenever you are looking through the database, and you would like to undo at least one of the transactions inside. 
Set transaction    
This command is the one that you can use any time that you are trying to take the transactions in your database and give them names.
You will often use this one whenever you are trying to label things for a bit more organization.  
All six of these types are going to be important based on the results that you would like to get out of your search.
Each of these will be explored a bit more as we go through this guidebook so that you understand better how to use them, when to use them, and how to divide up the information in the proper way to avoid issues and to keep your database nice and organized with the help of the SQL language.  
Each company that provides database products has its own path to be an "expert".
For instance, Microsoft offers an assortment of accreditation to guarantee that each Microsoft SQL Certified meets their criteria.
Oracle does exactly the same thing with their Certification process.