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

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!!

Find all the dates in a date range ? TIP #100

 

It’s almost one month that I didn’t write anything on the blog due to some personal reason. I am really sorry for that.

Now , Lets talk about the scenario sometimes we need to generate a report of total sales in particular date range but the condition is you need to show all the dates whether there was any sales or not.

So first and most important thing for us is to determine all the dates between that particular date range and then determine total sales date wise.

To determine the all the dates which reside between from date & to date  we have 2 approches

First the classic approach with while loop  as shown below

DECLARE @StartDate AS DATE = ‘2005-07-01′
DECLARE @EndDate   AS DATE = ‘2005-07-29′
DECLARE @tblDateRange AS TABLE (salesDate DATE)
DECLARE @SeedDate AS DATE
SET @SeedDate = ‘2005-07-01′
WHILE @SeedDate <= @EndDate
BEGIN
  INSERT INTO @tblDateRange(salesDate) Values (@SeedDate)
  SET @SeedDate  = DATEADD(d,1,@seedDate)
END
SELECT * FROM @tblDateRange

Indiandotnet_While_Date

Now second and interesting approach

DECLARE @StartDate AS DATE = ‘2005-07-01′
DECLARE @EndDate   AS DATE = ‘2005-07-29′
DECLARE @tblDateRange AS TABLE (salesDate DATE)

;WITH DatesCTE
AS (
SELECT @StartDate AS SalesDate
UNION ALL
SELECT DATEADD(d,1, SalesDate) As salesDate
FROM DatesCTE
WHERE DATEADD(d,1,SalesDate) <= @EndDate)

INSERT INTO @tblDateRange(salesDate)
SELECT * FROM DatesCTE

SELECT * FROM @tblDateRange

Indiandotnet_CTE_Date_Range

These are the 2 simple approaches which I like. I appreciate if you share other approaches which are simple & interesting.

Thanks

RJ

Enjoy !!!

How to hide my SQL Server instance in network ? TIP #99

 

In TIP #70  we saw how to find all the running SQL SERVER instance in a network or a machine.

to revise see below image.

1

This tip is just opposite to tip #70 you don’t want that your co-worker see your SQL Server instance running on your machine machine. (There are several reason behind this Smile  and security is one of the most valuable aspects)

To achieve this you just need to do a very simple setting. Just follow below steps

1) Open “SQL SERVER Configuration Manager”

2

2) Once the screen is open right click on the instance which you want to hide from network (under  SQL SERVER network  configuration ) as shown below

3

3) When you click on Properties menu you will get a new screen as shown below

You need to set the value of Hide Instance option to Yes.

4

4) Click on apply button and restart the services.

Great , We achieved it. Isn’t it simple ?

I appreciate your feedback.

Enjoy!!!

RJ!!!

I am not able to access my SQL server instance on another computer tip #98

 

On last Friday , one of my colleagues had some issue related to accessing of SQL Server instance of database server machine in the office through his machine. I think this is generalized problem and might be faced by many of us.

So to begin with  default port of SQL SERVER is 1433 , I am sure most of us aware of this.

If we are facing such issue then most of the time it means port 1433 is not opened on SQL SERVER instance machine.

To open the port 1433  we have to follow below steps 

1) Open firewall (using Firewall.cpl command ) as shown in below figure

1

2) You will get below screen now click on Advance setting option as shown in below screen

2

3) You will get a new screen. In this we need to add a new rule for for “Inbound” & “outbound” by clicking the respective navigation menu. When you will click on “Inbound rule or outbound rule you will below screen. Now click New Rule link as highlighted below

3

4) When you click the New rule link you will get a new screen. Now in this screen select port radio button and click on next button 

4

5)Now add specific local port 1433 as shown in below figure 

5

When you click next button you need to choose option “Allow the connection” and you are good to go by click Next button

6

 

These same steps you have to follow for Inbound & outbound rules and your SQL port 1433 will be open and you will be able to access your sql server instance from other computer machine.

I hope this tips might resolve your problem too.

Enjoy!!!!

RJ!!!

How to send E-mail/E-mail with Attachments in SQL Server TIP #97

 

In last post, TIP#96 We have configured Database E-mail. Now in this post we will see how to send mail in SQL SERVER.

Sometimes we need to send mail for different requirements like

1) Notification mails like  data inserted /updated/deleted successfully

2)Send data reports like no of amount earned, failed transaction  etc.

for this SQL SERVER provides us stored procedure “sp_send_dbMail”.

The “SP_send_dbmail” has various parameters below are some important parameters like

@profile_Name : The profile which will use to send mail

@Recipients : To whom the mails need to be send

@body : This is message body

@Subject: Subject of the mail

@Query : SQL statement which you want to share

To send a simple E-mail  we can write following statements

EXEC msdb.dbo.sp_send_dbmail
    @profile_name = ‘IndiandotnetMailSmtp’,
    @recipients = ‘rajatjai@gmail.com’,
    @body = ‘Mail sent successfully.’,
    @subject = ‘Mail via SQL SERVER ‘ ;

We can also send a query result either inline text format or html format or as a  attachment

Below query will send mail to me with count of students of a class. the below mail is simple text format mail

EXEC msdb.dbo.sp_send_dbmail
    @profile_name = ‘IndiandotnetMailSmtp’,
    @recipients = ‘rajatjai@gmail.com’,
    @query = ‘SELECT COUNT(1), Class FROM IndiandotnetDB.dbo.tblStudent GROUP BY class’ ,
    @subject = ‘Mail via SQL SERVER ‘ ;

The above mail can also be send mail as a attachment with following command

EXEC msdb.dbo.sp_send_dbmail
    @profile_name = ‘IndiandotnetMailSmtp’,
    @recipients = ‘rajatjai@gmail.com’,
    @query = ‘SELECT COUNT(1), Class FROM IndiandotnetDB.dbo.tblStudent GROUP BY class’ ,
    @subject = ‘Mail via SQL SERVER ‘ ,
    @attach_query_result_as_file = 1 ;

We can add @body_format = ‘HTML’ and use various HTML tag in query or body parameters

A part from this you can cross check E-mail status whether mail is sent or not if it is not sent the what is the reason.

Below are the statements which can help to cross check mail sent status

— Show all the emails

SELECT * FROM msdb.dbo.sysmail_allitems

— Show all the  sent mails
SELECT * FROM msdb.dbo.sysmail_sentitems

— show all the un sent mails
SELECT * FROM msdb.dbo.sysmail_unsentitems

— show all the failed mail with reason
SELECT * FROM msdb.dbo.sysmail_faileditems

I hope this might help you somewhere.

Enjoy!!

RJ

How to Configure E-mail in SQL Server Step by Step–TIP #96

 

For different reason we need to send database report , data and other SQL Server database related stuff using E-mail . SQL  Server provides E-mail functionality using “Database Email” feature. We can setup any E-mail  in few simple steps.

Let’s follow below steps

Step 1:- Open “Management” option of object Explorer in SQL SERVER  management studio.

You will find “Database Mail” option. now click on configure Database mail option as shown below

 1

Step 2:- When you click on Configure database mail you will get below wizard screen

2

Step 3:- Click on next button then you will below screen which is basically provide you option to setup or manage existing profile . In our case we are going to create a fresh database mail so let the first default option as is as shown in below figure and click on next button

3

Step 4:- You will get below screen. Just give a unique profile name and click on ADD button which is highlighted

4

Step 5: Now this is the main setting of mail “SMTP settings”

In this screen we have to give proper E-mail address, password , SMTP server name & Port number. In below screen I used gmail settings for a my gmail account. You can use any email address

5

Step 6:- Once you assure that everything is perfect in above screen then click on OK button. When click Ok button this SMTP profile will be saved and you can find in below screen now click on next button

6

Step 7:-  If you want you can make this profile as public default profile means default this profile will be use if someone wants to send mail from sql database. Now click Next button till the end of wizard you will following screens.

 

7

8

9

Step7:- Now click on Finish button then your setting will be actually saved in database and below screen will appear.

10

Now Once you close the above screen you are good to go.

You can test this by sending a test mail to your account using following screen

11

I hope this steps may help you to setup database email.

Enjoy Database E-mail and try to send a test mail to me also.

Enjoy !!

RJ

Good things should be appreciated–SQL sentry Plan Explorer TIP #95

Although , It is out of box but I would like to share here. I am very choosy in food. When my mother/wife cooked food and I didn’t like the taste then I explicitly said I didn’t like but when food taste was awesome then I didn’t say a word.

My mother taught me “You should appreciate every thing which is good.” Your single appreciation word do things

1. You yourself feel better

2. The person who did the good thing will be motivated to do more good things (in my case more tasty food wow Open-mouthed smile)

This lesson of my mother is now one of the rule life.

So here I would like to say  one of the best tools I came across is “SQL Sentry plan Explorer”.   There are various great features of this tool but I would like to share few things which attract me more

1) It comes in two versions (Basic & professional ) .Basic version is absolutely free free free.

2) It makes SQL developer’s life easy. You can easily  cross check query plan easily.

see below snap.

Easy_track_of_plan

You can also view logical read ,table scan and various other useful data

features

You can download this from http://www.sqlsentry.com/

Enjoy!!

RJ!!

LESS but it is more–CSS Preprocessor with ASP.NET

 

Now a days a “ CSS  pre processor “ is a very famous buzz word.  Although I am a web developer but still I am not always interested in writing CSS  don’t know why.

When I heard about css pre processor then I was curious to know what it exact about.

So let me share my thought here about CSS Preprocessor.

So a  CSS pre processor is a way to extend the CSS language and variables, functions and programming  stuff.

As a developer you will be more happy to have pre processor because it allows you to write code and also reduce the amount of css up to some extent.

There are many CSS  pre processor are exists in the market  like LESS, SASS,

Stylus,clay and many more.

Now Let me share here how to use LESS.css in your ASP.NET code.

Step 1:-  Add  Nuget package Less.js

Less_Nuget_Package

once you added this package in your script folder you will get 2 new java script file with prefix less as shown below in figure

Less_Script

Step 2:- Now right click on content folder and add a new item which is LESS style sheet. This file will have extension .less

 

Less

Step 3:-  Now you can write your LESS related code as shown in below snap

lesscss

If you see above snap I declared  variable like @back-color , @font-color etc

and used in body.

Step 4: Now  add a web page and write following lines to enable LESS css.

<link href="Content/MyLessCss.less" rel="stylesheet/less" />
   <script src="Scripts/less-1.5.1.min.js"></script>

Test_Less_Page

step 5:- Now in web.config we need to add following mime type

Webconfig_less

Or you can add this from IIS.

Step 6: Now we are good to go and can run  it

sample_Less__page

So we get the color according to variable which we declared.

It means we can play with the variables and can write the less code in programming way.

I hope this post will give a step to go further and I am sure you will deep dive in CSS pre processor soon.

Enjoy !!!

RJ !!

Very useful SET XACT_ABORT TIP#94

 

SET XACT_ABORT is one of the hidden gem we can say. It is helpful in many ways.

Let me explain by an example suppose you are working on a stored procedure which is doing a complex data manipulation. You though this query will run with in 1 minute when you run it from .NET or other code , but some how it took quite long time and with in one minute .NET or the code from which you run the query raised a command timeout.

Or we can say you have applied transaction in stored procedure and calling from .NET code and you have mention the command timeout in .NET .The ADO.NET program raised a timeout but still your query is running in background.

Now in such situation sometimes it happened the transaction which is running in SQL SERVER will be open transaction. Which might be a cause of locking problem.

In such situation  XACT_ABORT option is helpful.

By default XACT_ABORT option is off you can on it by following statement

   SET XACT_ABORT ON;

Now when this statement is on and if you face same situation as mentioned above it will rollback entire batch.

Let me explain with below example

Suppose I wrote following statement “Notice here XACT ABORT is OFF

image

Now , when I run the above statements I will get following result in result window

image

And in the message window we will get following result

image

What it means instead of the error at least 3 records are inserted but sometimes you require either all or no record commit in the table then let me enable the option XACT_ABORT ON in the query

image

Now let me re run the statements again. When I run the above statements I got following result in message tab there is no result tab.what is means ??

image

It means what ever inserted is roll backed when an error occurred in a statement. Although The above example is not the best example of XACT_Abort but it will help to understand how to use it.

 

I appreciate your inputs on this valuable topic.

Thanks

RJ!!!