Saturday, June 20, 2015

A myth about view TIP #102

 

I don’t know why every interviewer’s favorite question “Can we insert record using View ?” If you say Yes/No the interviewer will roaming around like so Can you update record using View?  or Can you delete record using view ?

I  hope everyone who is reading this article will be aware of what is view and how to create it ?

If not then need not to worry

“View can be see as a virtual table based on SQL SERVER result or in other world it is a layer above actual data tables” Or we can say when you want to hide actual table then you create a view wrapper”

You can easily create a View with following syntax

“CREATE VIEW

AS

QUERY “

Let’s understand this by an example.

Suppose in I have a database with name “IndiandotnetDB” which has a  table “tblStudentSource”

Now I created a  view just for fetching records from tblStudentSource

 

CREATE VIEW StudentSourceView
AS
SELECT StudentId,
       FirstName,
       LastName,
       Course,
       Detail
FROM tblStudentSource

Go

Now you can fetch records directly from  View as shown in below

SELECT * FROM StudentSourceView

You will get all the records from tblStudentSourceView

Now the Question “ Can you Insert record from View ?“

So the answer is specific condition you can.

In our scenario we will write following command and execute so the record will be added

Indiandotnet_View_1

So you are clear that we can Insert records from View.

In similar fashion we can update the records as shown below figure

We will following SQL statement as showing in figure in which we are going to update record no 2004 as shown in above figure

Indiandotnet_View_2

As shown record 2004’s FirstValue is updated to value “Updated”

 

Now in similar way we can delete the record using View.

Although there are certain other factor due to which “Insert/update/delete” is possible.

like we have only simple schema.

I will describe this later with more detail like  scenario where  we can not Insert/Uppdate/delete using view.

Till than Enjoy !!!

 

Thanks

RJ

Thursday, June 18, 2015

Bulk Copy Program (BCP)–A simple way to export data in a file TIP#101

Let’s consider a scenario where the end user require a CSV file of all the records in a table then BCP is one of the simplest way.

BCP stands for Bulk copy program. By the name you got the feeling of lots of data Smile.

Although, there are various options & parameters available with BCP but here we will talk about simple one Smile.

To understand it more clearly lets consider an example.

I have a database with name “IndiandotnetDB” and in this database I have a table with name tblStudentSource which having few records as shown in below figure

Indiandotnet_tbl_Student_Source

Now, the objective here is to export all the data which is in tblStudentSource table to a CSV file.

to achieve this we will use BCP command.  We are running BCP from command prompt as shown in below figure

Indiandotnet_BCP_1

Although there are various other options available with BCP command but for current post I choose simple one .

Now let me explain the command

BCP IndiandotnetDb.dbo.tblStudentSource OUT d:\File\output\sampleExport.csv –S . –T –c

so in above command “IndiandotnetDB” is my database

“dbo” is schema

“tblStudentSource” is  a table whose data need to be export

OUT – here out stands for export (export the table or query data)

“D:\File\output\” is folder where I want exported file

“sampleExport.csv” is file name which will be created by BCP and contains entire records after execution of BCP command

-S is stands for server I used “.” for localhost we can provide instance name as well

-T is for trusted connection (we can use – U for username – P for password)

-c is stands for character data type if you are not using this then you have to provide data type for each fields of output query result

Below is the output of the command which we run “ a sampleExport.csv file with all the records”

Indiandotnet_BCP_Export_Result

I hope this simple post will help you some where. I will share more details about BCP command in coming post.

Thanks

RJ!!