Check out example codes for "what is sql". It will help you in understanding the concepts better.

Code Example 1

Structured Query Language

A language which enables a user to create, modify and
essentially interact with a database.
Two of the most common Database Management Engines are
MySQL: https://www.mysql.com/
PostgreSQL: https://www.postgresql.org/

Code Example 2

SQL is a domain-specific language used in programming and designed for managing
data held in a relational database management system, or for stream processing
in a relational data stream management system.

Code Example 3

SQL is basically a programming language that lets people manipulate databases.

Code Example 4

CREATE TABLE friends (
   id INTEGER,
   name TEXT,
   birthday DATE
);

INSERT INTO friends (id, name, birthday) 
VALUES (1, 'Jane Doe', '1990-05-30');


INSERT INTO friends(id , name , birthday)
VALUES(2 , 'APOORV' , '2000-2-2');



UPDATE friends
SET name = 'Jane Srivastava'
WHERE id = 1;

ALTER TABLE friends 
ADD COLUMN email TEXT; 


UPDATE friends 
SET email =  '[email protected]'
where id  = 1; 

UPDATE friends 
SET email =  '[email protected]'
where id  = 2;

DELETE FROM friends 
WHERE id = 1;


SELECT * 
FROM friends;

Learn ReactJs, React Native from akashmittal.com