how do you use sql code example

Example 1: what is sql

SQL stands for:
Structured Query Language

It's language which enables a user to create,
modify and essentially interact with a database.
As a tester we are usually using Data manipulation
language part of SQL

SQL has 2 parts:
1-DATA MANIPULATION LANGUAGE
It is used to add, retrieve or update the data.
= insert, select, update, delete

2-DATA DEFINITION LANGUAGE
It is used to create database schema and can
be used to define some constraints as well.	
=create, alter, drop, truncate

create table
create window etc.

Example 2: what sql stand for

Structured Query Language

Example 3: how do you use sql

Our web application uses Oracle database and 
I normally write queries to do Data validation. 
For example: 
I create data from UI or I send POST request
from API then I write query to verify that
data was successfully and correctly inserted
into database. Our database consists of
many tables, so most of the time,
I need to write queries that involve joins.

CAN MENTION: Since our application has
large sets of data, data is stored into
Oracle and to another CACHE database. 
I write queries to test data that both are in SYNC(same).