Basic SQL Tutorials

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  • Database management system

    Why use a Database? The need to manipulate large collection of data for frequent used data queries and reports.
  • Primary key vs Candidate Key in Table SQL Database

    The main difference between a primary key and candidate keys are that all the columns in a table which are eligible to become the primary key e.g. the
  • Clustered vs non-clustered Index in database

    The main difference between the Clustered and a Non-Clustered index is that Clustered index defines the physical sorting order of data i.e. how data
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  • Difference between Unique and Primary key in SQL

    The main difference between the primary and unique key in the database is that primary key is not null but unique can be null. Both Primary and unique
  • What is a database index

    This article will give you a general overview on what indexes are without digging into too much detail.
  • Time zones in databases

    Description how different databases handle time zones.
  • SQL subqueries fundamentals

    Tutorial explains the main difference between correlated and nested subquery.
  • Having vs where clause in sql

    This tutorial explains differences between Having and where clause in sql.Where clause is used with update,select,delete but Having clause is used onl
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  • How to create update and delete columns in SQL

    One of the three main task you in SQL is creating, updating and deleting columns of tables. This tutorial explains how to create, update and delete co
  • SQL query to find second Maximum Salary from Table

    How to find 2nd maximum, 3rd maximum or Nth maximum salary or Employee is a classical SQL Interview question. There are many ways to find Nth highest
  • SQL command to copy table with data

    It is a good decision to take backup of a table before doing any modification or inserting data on that table. In this article, we will learn a SQL co
  • How to find duplicate rows in a table in MySQL and Orac

    Many times, we need to find out duplicate records in a table. This article shares couple of SQL queries, which we can use to find duplicate rows. thes
  • Inner Join of three tables in SQL MySQL Oracle Server

    INNER JOIN is used to fetch data from multiple tables in one query, it helps to save database round trips, but getting data from more than two tables
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