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SQL Archives - Page 5 of 5 - Testingpool

Testingpool

Software Programming Guide

Category: SQL

Sub Queries [ Uncorrelated Sub Queries ]

SQL

Sub Queries [ Uncorrelated Sub Queries ]

A Subquery as the name suggests , is an Inner Query nested or embedded within another SQL Query also called Outer Query.   Key Facts about Sub Queries. The Inner Query or the Subquery...

Views

SQL

Views

Understanding Views: To understand views let’s take an e.g. of a mirror from our day to day life. We can see exact replica of ourselves  in the mirror i.e. Virtual image. View is a also...

Indexes

SQL

Indexes

​ Understanding Indexes : To understand what are Indexes, let’s take a very common example of Index at the back of a book. In Book, Index displays the reference page number for each topic.For...

Data Definition Language ( DDL Commands )

SQL

Data Definition Language ( DDL Commands )

What are DDL Commands ?? Data Definition Language ( DDL Commands ) as the name suggests , are used to define and modify the database objects definitions. They are auto – saved or Auto –...

SQL Statements .

SQL

SQL Statements .

What are SQL  Statements ?? SQL Statements are basically commands that are used for : Defining the database objects Manipulating the data Controlling the transactions Deciding the access level of the users for database...