Different types of joins, DOT NET Programming

Assignment Help:

What are the different types of joins?

1) INNER JOIN:

The Inner join shows matches only when they exist in both the tables.For example, in the SQL below there are two tables Customers and Orders and the inner join in made on the Customers Customerid and Orders Customerid.Therefore  this SQL will only give you the result with customers who have orders.If the customer does not have order it will not display any record.

SELECT Customers.*, Orders.* FROM Customers INNER JOIN Orders ON

Customers.CustomerID =Orders.CustomerID

2) LEFT OUTER JOIN:

The Left join will display all the records in left table of the SQL statement.In SQL below the customers with or without orders will be displayed. The Order data for customers without orders appears as NULL values. For example, you want to determine the amount ordered by every customer and you need to see who has not ordered anything as well. You can also see the LEFT OUTER JOIN as a mirror image of the RIGHT OUTER JOIN (Is covered in the next part) if you switch the side of each table.

SELECT Customers.*, Orders.* FROM Customers LEFT OUTER JOIN Orders ON

Customers.CustomerID =Orders.CustomerID

3) RIGHT OUTER JOIN :

The Right join will display all records in the right table of the SQL statement. In the below SQL all orders with or without matching customer records will be displayed. The Customer data for orders without customers appears as NULL values. For example, you want to determine if there is any order in the data with undefined CustomerID values (say, after a conversion Or something like it). You can also see the RIGHT OUTER JOIN as a mirror image of the LEFT OUTER JOIN if you switch the side of every table.

SELECT Customers.*, Orders.* FROM Customers RIGHT OUTER JOIN Orders ON Customers.CustomerID =Orders.CustomerID


Related Discussions:- Different types of joins

What happens when aspx page is requested from browser ?, The steps that occ...

The steps that occur when we request a ASPX page are as follows:- 1) The browser sends the request to the webserver. Now  assume that the webserver at the other end is IIS. 2

Built a fairly standard core application skeleton, Here's the General Backg...

Here's the General Background on our project work: We need your help building out a new application that's part of a new startup in the Silicon Valley. We've built a fairly s

Sydney part/developer - full time programmer required, Project Description:...

Project Description: We require a Part time or long contract, Programmer/Developer working in Sydney. Task - Write PHP software into asp.net. Develop new software to enhan

I want a panel for youtube views and facbook, I want a Panel for youtube vi...

I want a Panel for youtube views and facbook likes. I need a panel made that can increase facebook fanpage likes, and that will increase youtube video views. Youtube views an

Which template is use to display data in repeater control, Which template m...

Which template must you provide, in order to display data in a Repeater control? ItemTemplate.To display data in the ItemTemplate, declare one or more Web server controls and s

Describe the services that uddi provides to web applications, Describe the ...

Describe the services that UDDI provides to Web applications. UDDI gives the following types of services to a Web application: XML Schema for business descriptions - Contain

Bug correction and prediction, Bug Correction and Prediction Project Des...

Bug Correction and Prediction Project Description: The project is about the prediction of bugs and resolves the bug in the sample program using costriage algorithm. You have

Creating dynamic web pages, As you have probably realized by now, Web pages...

As you have probably realized by now, Web pages are much more useful when they are dynamic. In Internet terminology, the word dynamic means several things. Primarily, it refers to

Various ways of authentication techniques in asp.net, What are the various ...

What are the various ways of authentication techniques in ASP.NET? The Selection of  an authentication provider is as simple as making an entry in  the web.config file of  the

Develop a scrapebox software, Develop a scrapebox software Project Descr...

Develop a scrapebox software Project Description: I need a software name scrapebox Skills required are .NET, C Programming, Java, C# Programming, Software Architecture

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd