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Page Index

DBMS Introduction

What is DBMS ?
Types of Database
What is RDBMS ?
DBMS vs RDBMS
DBMS vs File System
DBMS Architecture
RDBMS 12 Codd's Rule

MySQL Database

MySQL features
MySQL Create Database
MySQL Select Database
MySQL Show Databases
MySQL Drop Database

MySQL Tables

MySQL CREATE Table
MySQL ALTER table
MySQL Select Show Tables
MySQL Rename Table
MySQL Drop Tables

MySQL Queries

MySQL Constraints
MySQL INSERT Record
MySQL UPDATE Record
MySQL DELETE Record
MySQL SELECT Record

MySQL Clauses

MySQL WHERE
MySQL DISTINCT
MySQL FROM
MySQL ORDER BY
MySQL GROUP BY
MySQL HAVING

MySQL Conditions

MySQL AND
MySQL OR
MySQL LIKE
MySQL IN
MySQL ANY
MySQL EXISTS
MySQL NOT
MySQL NOT Equal
MySQL IS NULL
MySQL IS NOT NULL
MySQL BETWEEN

MySQL Keys

MySQL Unique Key
MySQL Primary Key
MySQL Foreign Key
MySQL Composite Key

MySQL DISTINCT STATEMENT

MySQL DISTINCT clause is used to remove duplicate records from the table and fetch only the unique records. The DISTINCT clause is only used with the SELECT statement.

SELECT DISTINCT expressions  
FROM tables  
[WHERE conditions];

expressions: specify the columns or calculations that you want to retrieve.

tables: specify the name of the tables from where you retrieve records. There must be at least one table listed in the FROM clause.

WHERE conditions: It is optional. It specifies the conditions that must be met for the records to be selected.

Let's move on to usuage of from keyword in MySQL

MySQL WHERE

MySQL FROM

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