What is SQL How does it work?

How does SQL query work?

SQL Query mainly works in three phases . 1) Row filtering - Phase 1: Row filtering - phase 1 are done by FROM, WHERE , GROUP BY , HAVING clause. 2) Column filtering: Columns are filtered by SELECT clause. 3) Row filtering - Phase 2: Row filtering - phase 2 are done by DISTINCT , ORDER BY , LIMIT clause.

What is SQL simple explanation?

Basically, SQL stands for Structured Query Language which is basically a language used by databases. This language allows to handle the information using tables and shows a language to query these tables and other objects related (views, functions, procedures, etc.).

What is SQL and why is it useful?

SQL is used to create a database, define its structure, implement it, and perform various functions on the database. SQL is also used for accessing, maintaining, and manipulating already created databases. SQL is a well built language for entering data, modifying data, and extracting data in a database.

What is SQL explain with an example?

An SQL SELECT statement retrieves records from a database table according to clauses (for example, FROM and WHERE ) that specify criteria. The syntax is: SELECT column1, column2 FROM table1, table2 WHERE column2='value';