SQL may not be a standard programing language, but it is a database management language. It allows the creation of queries.
It has all the features and functionalities of a programming language. Oracle V2 first used SQL in 1979 for commercial purposes. ANSI and ISO adopted the official standard of SQL in 1986 and 1987 respectively.
Why do we use SQL?
That was a brief intro into the history of the language. It still does not describe the true functionalities and features of SQL. The standard language has four main sublanguages.
DML or data manipulation language: it is useful for manipulating and pulling the data stored in the RDBMS. A standard DML statement allows you to select, insert, delete and update all data in the tables. SQL DML statements are declarative.
DDL or data definition language: the name is quite self-explanatory. It can define data structures in the RDBMS. The object types depend on the DBMS, which includes users, tables, databases, and smaller housekeeping objects too.
DCL or Data control language: it can control and manipulate the data stored in the database. The DCL statements have the potential to revoke privileges and allow certain DDL, and DML commands to reach database objects.
TCL or transaction control language: this is to control the processing of transactions inside the relational database. The general TCL statements in a MySQL database environment include – commit, rollback and savepoint to apply changes, undo changes and divide the transaction into several smaller parts respectively.
Who needs SQL?
A remote DBA or a program can use SQL queries for a local relational database. Storing SQL statements and compiling them in remote RDBs is a daily practice for most RDBMS. Its simplicity and high throughput nature make this programing cum query language most popular among all coders and database managers.
If you have a website, you are likely storing the site content in a relational database. It will include all consumer information, card details, product details, buying history and shipment details. You need separate tables for these. We have seen webmasters pile everything into one table and use a single primary key. It creates a lot of confusion when you go to pull particular data, like a customer's contact details from the relational database.
In such cases, you need help from remote DBAs to store, update, add, delete and pull relevant information from the tables. They will use a simple yet powerful query language like SQL to complete these procedures.
You do not need to be a DBA to know SQL, but if you want to be a DBA, SQL knowledge is indispensable. MySQL, Oracle, SQ Lite and PostgreSQL databases use SQL programming language. Starting with YouTube tutorials is a rather refreshing and rewarding way of learning this language.