It is known as Structured Query language and is used in programming as well as designing for management of data that is being held in RDBMS or also stream processing in RDSMS. It is mainly used for handling structured data that is data incorporating relations among variables and entities.
It gives two major advantages over the older used API like ISAM or VSAM for read-write operations that is it made the concept of accessing the thousand of records in a single command and secondly also eliminates the need of specifying how to access the record that is with or without the index.
SQL is based or formed on relational algebra and tuple relational calculus.
It consists of many types of statement, which can be classified as sublanguages:
DDL- Data Definition Language:
It is a syntax for defining the data structures in database schemas. It is used to create and modify database objects like tables users and indexes. Common DDL operations are:
DML- Data Manipulation Language:
It is a syntax or language that is used for inserting, deleting and modifying data in a database. common DML operations are:
DCL- Data Control Language:
It is a syntax that is used to control access to data stored in a database.it includes only two commands that are:
Restriction in DCL
DQL- Data Query Language:
it is a syntax or language used to make queries in databases it tries or attempts to give factual answers to factual questions.
TCL – Transaction Control Language:
These commands are used to manage the transactions in the database. these commands are used to manage the changes that are being made by the use of the DML statements.
So, when combined the what has been listed above it allows us to frame the important information that within our database using meaningful representations. there are many people who start learning different languages like python, java, c or c++ and they think SQL learning like a deviation from the goal. Yes, it is not an object-oriented language, but it is a declarative language. So we have to keep in mind that SQL is very essential language as it is being used in various applications and web applications.so, whether we are running the online site or maintaining the app there comes a point where we have to store some kind of information and that’s where SQL comes into the play.
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