SQL, or Structured Query Language, may be an important point to consider in the study of computer network engineering. SQL, as a programming language, has a long history and development. Of course, these developments are influenced by the advancement of technology, which is getting better by the year. So, whether you like it or not, new technology is used to create a lot of software, but it does not eliminate the need for SQL.
Then, perhaps, some of you are wondering what SQL stands for. What are the SQL functions, and what are the basic commands you must know? All of the reviews can be found in the writings listed below.
Understanding SQL
SQL, or Standard Query Language, is a programming language used to access, modify, and manipulate relational-based data.
Of course, the computer language used in this relational database is based on American National Standards Institute standards (ANSI). SQL standardization has been around since 1986, when ANSI initiated it.
Until recently, many servers in a database or software could interpret the SQL language. As a result, SQL is a topic of discussion and a valuable resource for those of you who are struggling in the IT world and with relational databases.
The history of the emergence of SQL
If we talk about the history of the emergence and understanding of SQL, we can refer to the article by Jhonny Oracle, who is a researcher at IBM. The article discusses the idea of creating a relational database that emerged in 1970—to be precise, in June.
The article also discusses the possibility of creating a standard data language in the future. That's why the term "SEQUEL" emerged, which refers to the abbreviation of Structured English Query Language.
After some time, IBM launched the SEQUEL relational database project, which was shortened to SQL due to its difficult spelling.
SQL was overhauled in 1989 after the standardization process was completed in 1986. SQL92 was released in 1992, and SQL99, with various updates, was released in 1999.
In the IT world, however, SQL is frequently used to refer to SQL92. Nonetheless, there has been no data-based server that uses or supports SQL99 until now. This is more dependent on the dialect used by each server.
What Professions Need SQL Skills?
After discussing what SQL is, let's talk a little about the types of jobs that require SQL skills.
Because SQL is closely related to data management, most professions in the data field require skills to use this query system.
Below are some jobs that require SQL skills:
1. Data Scientist
A data scientist is someone who works on creating databases, processing data, and translating it into something more easily studied—this translation is known as a data product.
A company will later use this data product as a reference to make business decisions and other policies. Data scientists require SQL data management skills due to the nature of their work, which is closely related to data.
2. Data Engineer
A data engineer is responsible for finding trends or patterns in a data set, then developing an algorithm to make that data useful for the company.
In addition, the data engineer is also responsible for building algorithms that can be used to access raw data more easily. Therefore, data engineers need expertise in SQL to facilitate data management.
3. Business Analyst
Through business analysis, a business analyst assists companies in developing processes, products, services, and software. In general, a business analyst will conduct a gap analysis in order to identify the steps required to advance the business.
If the gap analysis results are related to the data, SQL is required to locate the gaps in the data set. A thorough gap analysis is essential for a business analyst's success.
4. Database Administrator
A Database Administrator (DBA) is in charge of managing database software for storing, compiling, and accessing data in a mature system.
DBAs generally supervise a team of SQL programmers, which, of course, requires them to master the programming language.
5. Quality Assurance Tester
A A QA tester is generally tasked with checking for damage or problems in digital products such as applications, software, games, and websites.
Digital products such as the one above often store most of the user's information in an SQL-based database. To find out details related to damage and problems in digital products, QA testers are, of course, required to master SQL in order to find this information.
Types of SQL Commands
After you know the history and understanding of SQL, now is the time to learn more about the basic commands contained in the SQR. There are at least three basic types of SQL commands, whose descriptions will be discussed in the following points.
Data Definition Language (DDL)
Data Definition Language (DDL) is a command used to define data, such as creating new database tables, modifying datasets, and deleting data. Then, the basic DDL commands are further divided into at least five types of commands, which you can see below.
- The Create command: the command to create a new table in a database is create. Not only for new tables, but also for new databases and columns. You can create a query with the example of "CREATE DATABASE database_name."
- The Alter command is commonly used when someone wants to change the structure of a previously existing column. It could be in this case, such as table names, adding columns, changing, or deleting columns, and adding other attributes. You can use the rename command to change a name in an existing table or column. If you use this command, the query becomes' RENAME TABLE old table_name TO new table_name'.
- Drop command You can use it to delete anything, whether it's a database, table, or column to index.
- Show command This DDL command is used to display an existing table.
Data Manipulation Language (DML)
In SQL databases, the commands used to manipulate data are called Data Manipulation Language, or DML. Commands in DML are also divided into four types.
Some of them are insert, select, update, and delete.
- Use the Insert command to insert a new record into a database table. Then Select a command: Select is used to manipulate data with the aim of displaying or retrieving data in a table. The data taken is not only limited to one type, but more than one table using relations.
- You can use this command when you want to update data in a table. For example, if there is an error when entering a record, you don't need to delete it, and it can be fixed using this command.
- Delete command: This DML command can be used when you want to delete an existing record in a table.
Data Control Language (DCL)
The next basic command is Data Control Language, or DCL. This SQL command is used specifically to set what rights the user has. Whether it's rights to a database or to existing tables or fields,
A database administrator can use this command to keep a database's confidentiality. DDCL is based on the impocommand and is divided into two main commands, namely: Grant's order: This command is typically used by a database administrator to grant access rights to other users.
Of course, these access rights can be restricted or regulated. In this case, the administrator can also grant access to the commands listed in the DML above. Recall the command Revoke, the inverse of Grant, is frequently used to revoke or remove the permissions of a user who was initially granted access by the database administrator via the previous Grant command.
SQL Function
Do you know what SQL is? The existence of SQL in managing a database provides its own function. For an admin, the existence of SQL can allow you to access or change the database.
You can also run a query or retrieve the required data. This includes updating or inserting data in the database.
SQL can also be used to remove information from a database. Another SQL function is to create a new procedure, which is then saved in a database. Furthermore, it can set access rights in tables and procedures, among other things.
As a result, the concept of SQL can be defined as a special language used when creating and processing databases on a website. When managing a website, you must also use the best hosting service to ensure that your website runs smoothly.
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