SQL Tutorial For Beginners / SQL Online Tutorial: SQL (Structured Query Language) is a powerful programming language for managing and manipulating relational databases. So if you work with databases, you should learn SQL because SQL is the standard language used to interact with databases. That’s why it is essential for anyone in data management or analysis.
This SQL tutorial for beginners is designed to provide a solid foundation for the beginner and experienced learners. That’s why in this sql tutorial point, we cover basic SQL commands, data types, and sql tutorial database design and management. Follow this sql tutorial database and go step by step at the end of this sql tutorial for beginners. You can create and manage your database and perform basic queries to retrieve and manipulate data.
While preparing this SQL tutorial, we assume you have no experience with SQL. With this thought, we made this sql tutorial interactive so that this will be helpful for both beginners and experienced learners.
Parallelly, We are also working on providing you with these sql tutorial basics videos on various platforms like sql tutorial youtube on the SoftwareTestingo youtube channel and sql tutorials complete in PDF format so that you can refer to the concepts offline also. For that, you need to search sql tutorial for beginners pdf.
What Does This SQL Tutorial Cover?
In this SQL Tutorial For Beginners, you will learn the basics of SQL, and after that, we will dive deep into the advanced concepts. Here are the below concepts we are going to learn through the SQL tutorial:
Why Learn SQL?
Nowadays, if someone wants to build his/her career where they will work with data, whether it’s for managing a database, analyzing business performance, or generating insights for data-driven decision-making, then knowledge of SQL is mandatory. Because most industries, like finance, healthcare, retail, and many more, use relational databases SQL to store their Data.
In such cases, SQL comes into the picture Because it allows you to manage and manipulate data in various ways. That’s why it is an essential skill for anyone who wants to work with data in today’s digital world. So let’s start learning SQL without any further delay.
History of SQL
SQL (Structured Query Language) is a programming language that manages and manipulates relational databases. It was first developed in the 1970s by IBM researchers Donald D. Chamberlin and Raymond F. Boyce. The initial version, SEQUEL (Structured English Query Language), was designed to interact with IBM’s System R relational database management system.
What is SQL?
SQL (Structured Query Language) is a programming language that allows users to interact with the database through statements that perform specific tasks, such as creating new tables, inserting data into existing tables, and retrieving data from the database.
SQL also creates and modifies database structures like new or existing tables. As per our requirement, We can also use it to create and modify database constraints, such as primary and foreign keys, to ensure data integrity and consistency. Overall, SQL is a powerful tool for managing and manipulating data stored in a relational database.
Features of SQL
Here are some of the features of SQL which make this programming language popular and most used.
- SQL is a straightforward and easy-to-learn language, making it accessible to many users, from beginners to advanced programmers. This feature makes it popular among developers as they can quickly learn and use it to manage relational databases.
- SQL is versatile as it works with various database systems such as Oracle, IBM, Microsoft, etc. This means you can use SQL to manage databases on different platforms without learning different languages for each platform.
- SQL is an ANSI and ISO standard language for database creation and manipulation. This standardization ensures that SQL is widely accepted and used by many organizations and companies.
- SQL has a well-defined structure as it uses long-established standards. This structure makes it easy to use, understand, and maintain. It also ensures that the data stored in the database is consistent and accurate.
- SQL is speedy in retrieving large amounts of data very efficiently. This makes it ideal for large organizations where data retrieval speed is crucial.
- SQL lets you manage databases without knowing a lot of coding. This feature makes it easy for non-technical users to manage and manipulate data stored in a database without learning a lot of coding.
As mentioned earlier, SQL is also called Structured Query Language, and each language follows a unique set of rules and guidelines called sql syntax. To execute the SQL command, you must follow those rules, and we have discussed those rules in detail in a separate post. You can check the post for more details.
In SQL Server, a SQL comment is a statement or text in a SQL query that is ignored by the SQL Server engine and does not affect the execution of the query. Comments in sql server are used to provide notes, explanations, or reminders for the SQL developer or other readers of the SQL code.
SQL Data Types
As we have planned to upgrade our Skills with SQL, one important aspect of working with SQL is understanding the different data types that can be used to store information in a database. These data types include strings, numbers, dates, and more, each with unique properties and use. In this section of our SQL Tutorial post, we will discuss some of the most commonly used SQL data types and their characteristics.
SQL commands perform various operations on the data stored in a database, such as retrieving, inserting, updating, and deleting data. Several types of SQL commands can be used to perform different tasks. The most common types of SQL commands are DDL, DML, DCL, TCL, and DQL. We are trying to shorten this post, so we have discussed each SQL command in detail. You can check these posts by following the links.
SQL operators are special keywords or symbols used to perform operations on data stored in a relational database management system (RDBMS). They are used in SQL statements to filter, sort, and manipulate data. You can check the below posts to learn more about operators in SQL:
An SQL database is a highly structured table collection, with each row representing a data entity and every column defining a specific information field. These databases are built using a structured query language (SQL) to create, store, update, and retrieve data.
SQL table is a database object that stores data in rows and columns, much like a spreadsheet. Each column in a table represents a different data field, and each row represents a record. SQL tables can be created, altered, and deleted using SQL commands. They organize and manage data in a relational database management system (RDBMS).
SQL Insert Statement
SQL INSERT statement is a command to insert one or more data rows into a relational database table. SQL Insert is a Data Manipulation Language (DML) statement that allows you to add new records to a table.
SQL Update Statement
SQL Update is a statement used in Structured Query Language (SQL) to modify or update existing data records in a table.
SQL SELECT Statement
SQL SELECT is a command used in Structured Query Language (SQL) to retrieve data from a database. It is one of the most commonly used commands in SQL, and SQL Select is used to extract specific information from one or more tables in a database. Many more complex SQL SELECT statements allow you to perform more advanced queries, such as joining multiple tables, sorting data, and grouping data.
SQL ALTER Statement
The SQL ALTER statement is used to modify the structure of an existing database table. It allows users to add, modify, or delete columns and modify the columns’ data type, size, or constraints.
SQL Delete Statement
The SQL DELETE statement deletes one or more records from a table in a relational database.
SQL Truncate Table
SQL Truncate is a command that removes all the rows from a table in a relational database. Unlike the DELETE statement, which removes individual rows one by one, the TRUNCATE statement removes all the rows from the table at once.
In SQL (Structured Query Language), a clause is part of a SQL statement specifying a particular condition or action. Several types of clauses can be used in SQL. Some of the most commonly used clauses include:
A SQL key is a column or set of columns in a database table that uniquely identifies each row. Keys are used to establishing relationships between tables and ensure data integrity by preventing duplicate rows, ensuring referential integrity, and making the database more efficient and easier to manage.
SQL constraints are rules applied to the data stored in a relational database management system (RDBMS) to ensure its accuracy, consistency, and validity. Database designers and administrators define these constraints to specify how the data should be structured, what values are allowed or prohibited, and how the data can be modified or deleted.
In SQL Tutorial, SQL joins help combine data from multiple tables and is a powerful tool for data analysis and reporting. We can extract information from multiple tables based on a related column between them using joins. It enables us to retrieve data from different tables and provide more insights and information that might not be possible to obtain from a single table.
To conclude, we want to reiterate that SQL language is here to stay for a long time. It’s developed and evolved by many experts and has proven its efficiency. First, you can grab some introductory books on SQL or understand it through online SQL Tutorials or training. This SQL tutorial covers most of the basics you would look for in an introduction to SQL language.
But as the SQL Language has very vast concepts. So it will become very tough to cover all the concepts, but if you specify the missing ones, we will try to add them to this SQL Tutorial list.
Is SQL easy to learn for beginners?
In general, SQL is not too difficult to learn. Those who understand programming and have some experience with other languages can usually pick up on the basics of SQL in a few weeks. However, it may take longer for someone new to programming to grasp this language’s necessary concepts.
How long does it take to learn SQL fully?
Learning SQL can be accomplished in a few weeks, although gaining proficiency to use it professionally might take longer. After two or three weeks of study, one should have the essential skills down pat. Moving beyond basic knowledge and applying those learned concepts at work will require additional practice.
Is SQL still worth learning?
It is worth investing time and money into studying SQL, as numerous businesses rely heavily on data. The ability to store and manage this information using a database system such as SQL makes it an invaluable skill in today’s world, where data essentially equates to wealth.