First_value & Last_Value according to group set is that easy ? tip #44

 

Problem:- 

Most of the time we require data in which we require first value and last value from different group of rows. Now how easy we can get result this is one of the challenge for us.

Solution:-

Lets understand this by an example. Suppose you have a sales table in which you maintain daily sales. Now your want a result sent in which you know what is first sale of the day and what is last sale of the day.

SQL SERVER 2012 provides you facility to achieve this task easily with First_Value & Last_Value function.

The syntax of first_value & Last value is exactly same as Row_Number, Dense_Rank & Rank_function.

See below example in which I have used Adventureworks SalesOrderHeader table.

Now if you see below snap I took a random date 2005-07-12 and fetched record and highlighted is first row & Last Row.

So on date 2005-07-2012 Sales order have 3953.9884 as a frist value and  772.5036 as a second value.

 

Now above specific result  we can achieve by first_Value & Last_Value function of SQL SERVER 2012 as shown below

so, In this way you can achieve the first_Value & last_Value from a group of rows

I hope this may help you somewhere.

Enjoy !!!

RJ

Understanding of new VNext web project

 

Dear Friends,

As discussed in last post VNext launched. Now I downloaded VNext to test how to use it.

Let’s understand it step by step

Now when you will try to open new project window. You will find 4 new project template with name VNext as shown below in fig

 

I tried ASP.NET vNext Web Application.

Now I found a new structure of  Web application and surprised that in next project there is no web.Config file instead on it I found 3 different files

which are

1) Config.json

2) project.json

3) Startup.cs

Now lets understand these files one by one

1) Config.json :- Config.json  by the name it is clear that it will keep all the configuration detail Like your database connection string and etc will reside in this file. see below config.json’s snap

2) Project.json : Project.json file contents all the reference of the project the best part of it as you add the entries in this file it will automatically reflect your project reference. I personally like this  miracle

3) Startup.cs:-

It is something like your console application where you will provide startup file.This file is same like those feature which will startup all the things

Now let see actual physical project structure. You will find a new file which is Kproj.

The Kproj is new type file. “K” is new feature introduce. New compiler is used.

I will explain more features in next post.

Till than enjoy.

Thanks & Best Regards,

Rajat Jaiswal