That happens because sometimes it is necessary to drop and recreate a table in order to change something. This can take a while, since all data must be copied to a temp table and then re-inserted in the new table. Since SQL Server by default doesn't trust you, you need to say "OK, I know what I'm doing, now let me do my work." This problem occurs when the Prevent saving changes that require the table re-creation option is enabled, and you make one or more of the following changes to the table:

• You change the Allow Nulls setting for a column.
• You reorder columns in the table.
• You change the column data type.
• You add a new column.

When you change a table so that you alter the metadata structure of the table, and then you save the table, the table must be re-created based on these changes. This may result in the loss of metadata and in a direct loss of data during the re-creation of the table. If you enable the Prevent saving changes that require the table re-creation option in the Designer section of the SQL Server Management Studio (SSMS) Options window, you receive the error message that is mentioned in the “Symptoms” section.

To change the Prevent saving changes that require the table re-creation option, follow these steps:

• Open SQL Server Management Studio (SSMS).
• On the Tools menu, click Options.
• In the navigation pane of the Options window, click Designers.
• Select or clear the Prevent saving changes that require the table re-creation check box, and then click OK.

Note If you disable this option, you are not warned when you save the table that the changes that you made have changed the metadata structure of the table. In this case, data loss may occur when you save the table.

Risk of turning off the “Prevent saving changes that require table re-creation” option

Although turning off this option can help you avoid re-creating a table, it can also lead to changes being lost. For example, suppose that you enable the Change Tracking feature in SQL Server to track changes to the table. When you perform an operation that causes the table to be re-created, you receive the error message that is mentioned in the “Symptoms” section. However, if you turn off this option, the existing change tracking information is deleted when the table is re-created. Therefore, we recommend that you do not work around this problem by turning off the option.

To determine whether the Change Tracking feature is enabled for a table, follow these steps:

• In SQL Server Management Studio, locate the table in Object Explorer.
• Right-click the table, and then click Properties.
• In the Table Properties dialog box, click Change Tracking.

If the value of the Change Tracking item is True, this option is enabled for the table. If the value is False, this option is disabled.

When the Change Tracking feature is enabled, use Transact-SQL statements to change the metadata structure of the table.

Steps to reproduce the problem

• In SQL Server Management Studio, create a table that contains a primary key in the Table Designer tool.
• Right-click the database that contains this table, and then click Properties.
• In the Database Properties dialog box, click Change Tracking.
• Set the value of the Change Tracking item to True, and then click OK.
• Right-click the table, and then click Properties.
• In the Table Properties dialog box, click Change Tracking.
• Set the value of the Change Tracking item to True, and then click OK.
• On the Tools menu, click Options.
• In the Options dialog box, click Designers.
• Click to select the Prevent saving changes that require table re-creation check box, and then click OK.
• In the Table Designer tool, change the Allow Nulls setting on an existing column.
• Try to save the change to the table.

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It is not smart to execute multiple db request for loading single page.  Review your database code to see if you have got request paths that go to the database quite once. each of these round-trips decreases the number of requests per second your application will serve. By returning multiple resultsets in a single database request, you can cut the total time spent communicating with the database.

In order to enhance performance you should execute single keep proc and bring multiple resultset in to single dB request. In this article i will explain you how to avoid multiple database request and how to bring multiple resultset into single dB request. Consider a scenario of loading a Product Page, which displays:
Product information
Product Review information.

In order to bring two information request in single dB request, your sql server keep proc ought to be declared as below.

SQL Server Stored Proc

CREATE PROCEDURE GetProductDetails
 @ProductId bigint,
AS
SET NOCOUNT ON

--Product Information
Select ProductId,
 ProductName,
 ProductImage,
 Description,
 Price
From Product
Where ProductId = @ProductId


--Product Review Information
Select  ReviewerName,
 ReviewDesc,
 ReviewDate
From ProductReview
Where ProductId = @ProductId

Asp.net, C# Code to bring multiple db request into single db request
Code Inside Data Access Class Library (DAL)
public DataSet GetProductDetails()
{
SqlCommand cmdToExecute = new SqlCommand();
cmdToExecute.CommandText = "GetProductDetails";
cmdToExecute.CommandType = CommandType.StoredProcedure;
DataSet dsResultSet = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(cmdToExecute);

try
{
    var conString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnStr"];
    string strConnString = conString.ConnectionString;
    SqlConnection conn = new SqlConnection(strConnString);

    cmdToExecute.Connection = conn;

    cmdToExecute.Parameters.Add(new SqlParameter("@ ProductId", SqlDbType.BigInt, 8, ParameterDirection.Input, false, 19, 0, "", DataRowVersion.Proposed, _productId));

    //Open Connection
    conn.Open();

    // Assign proper name to multiple table
    adapter.TableMappings.Add("Table", "ProductInfo");
    adapter.TableMappings.Add("Table1", "ProductReviewInfo");
    adapter.Fill(dsResultSet);

    return dsResultSet;             
}
catch (Exception ex)
{
    // some error occured.
    throw new Exception("DB Request error.", ex);
}
finally
{
    conn.Close();
    cmdToExecute.Dispose();
    adapter.Dispose();
}
}

Code Inside Asp.net .aspx.cs page
protected void Page_Load(object sender, EventArgs e)
{
   if (Request.QueryString[ProductId] != null)
   {
      long ProductId = Convert.ToInt64(Request.QueryString[ProductId].ToString()); 
  
      DataSet dsData = new DataSet();

      //Assuming you have Product class in DAL
      ProductInfo objProduct = new ProductInfo();
      objProduct.ProductId = ProductId;
      dsData = objProduct.GetProductDetails();

      DataTable dtProductInfo = dsData.Tables["ProductInfo"];
      DataTable dtProductReviews = dsData.Tables["ProductReviewInfo"];

      //Now you have data table containing information
      //Make necessary assignment to controls
      .....
      .....
      .....
      .....
      ..... 

    }
}

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In this article I am going to explain how to save the youtube into database and display it in Gridview using Linq. I have got a requirement to save the youtube video URL into database and display them where user can play the videos. I have created a table Tb_videos which store the information video tile, description and URL as you can see on the following :

HTML Markup:
<table>  
<tr>
<td>Title :</td>
 <td>
     <asp:TextBox ID="txttitle" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Description :</td>
 <td><asp:TextBox ID="txtdescription" runat="server" TextMode="MultiLine" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Video URL :</td>
 <td><asp:TextBox ID="txturl" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td></td>
 <td>
     <asp:Button ID="btnsubmit" runat="server" Text="Submit" /></td>
 </tr>
</table>
<br />
    <asp:GridView ID="grdvideo" runat="server" AutoGenerateColumns="False"
        BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px"
        CellPadding="4" ForeColor="Black" GridLines="Vertical">
        <AlternatingRowStyle BackColor="White" />
    <Columns>
    <asp:BoundField DataField="Title" HeaderText="Title" />
    <asp:BoundField DataField="Description" HeaderText="Description"/>
   <asp:TemplateField HeaderText="Videos">
   <ItemTemplate>
   <object  width="480" height="385">
<embed src='<%#Eval("url") %>' type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385">
</embed>
</object> 
   </ItemTemplate>
   </asp:TemplateField>
    </Columns>
        <FooterStyle BackColor="#CCCC99" />
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <RowStyle BackColor="#F7F7DE" />
        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#FBFBF2" />
        <SortedAscendingHeaderStyle BackColor="#848384" />
        <SortedDescendingCellStyle BackColor="#EAEAD3" />
        <SortedDescendingHeaderStyle BackColor="#575357" />
    </asp:GridView>

Import the namespace
C#:
using System.Text.RegularExpressions;

VB:
Imports System.Text.RegularExpressions

Create the object of DBML:
C#:
BlogDataContext db = new BlogDataContext();

VB:
Private db As New BlogDataContext()

Get the Youtube video id
Write a function to get the youtube video id from youtube video URL .

C# Code:
private string GetYouTubeVideoID(string youTubeVideoUrl)
{
    var regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*",
                       RegexOptions.IgnoreCase);
    if (regexMatch.Success)
    {
        return "http://www.youtube.com/v/" + regexMatch.Groups[1].Value +"&hl=en&fs=1";
    }
    return youTubeVideoUrl;
}

VB Code:
Private Function GetYouTubeVideoID(ByVal youTubeVideoUrl As String) As String
    Dim regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*", RegexOptions.IgnoreCase)
    If regexMatch.Success Then
        Return "http://www.youtube.com/v/" + regexMatch.Groups(1).Value + "&hl=en&fs=1"
    End If
    Return youTubeVideoUrl
End Function

Save the record to database
On button click write the below given code to insert the record into database table.

C# Code:
protected void btnsubmit_Click(object sender, EventArgs e)
{
    try
    {
        string ytFormattedVideoUrl = GetYouTubeVideoID(txturl.Text);
        Tb_Video tb = new Tb_Video();
        tb.Title = txttitle.Text;
        tb.Description = txtdescription.Text;
        tb.URL = ytFormattedVideoUrl;
        db.Tb_Videos.InsertOnSubmit(tb);
        db.SubmitChanges();
        Response.Write("<script>alert('Record Inserted Successfully');</script>");
        BindGrid();
        Clear();
    }
    catch (Exception ex)
    { }
}
public void Clear()
{
    txturl.Text = string.Empty;
    txtdescription.Text = string.Empty;
    txttitle.Text = string.Empty;
}

VB Code:
Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnsubmit.Click
    Try
        Dim ytFormattedVideoUrl As String = GetYouTubeVideoID(txturl.Text)
        Dim tb As New Tb_Video()
        tb.Title = txttitle.Text
        tb.Description = txtdescription.Text
        tb.URL = ytFormattedVideoUrl
        db.Tb_Videos.InsertOnSubmit(tb)
        db.SubmitChanges()
        Response.Write("<script>alert('Record Inserted Successfully');</script>")
        BindGrid()
        Clear()
    Catch ex As Exception
    End Try
End Sub
Public Sub Clear()
    txturl.Text = String.Empty
    txtdescription.Text = String.Empty
    txttitle.Text = String.Empty
End Sub

Fetch the record from database and display
Create a method to get the record from database table and display in Gridview data control.

C# Code:
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGrid();
    }
}

public void BindGrid()
{
    try
    {
        var bind = from v in db.Tb_Videos
                   select v;
        grdvideo.DataSource = bind;
        grdvideo.DataBind();
    }
    catch (Exception ex)
    {
    }
}

VB Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGrid()
    End If
End Sub

Public Sub BindGrid()
    Try
        Dim bind = From v In db.Tb_Videos
        grdvideo.DataSource = bind
        grdvideo.DataBind()
    Catch ex As Exception
    End Try
End Sub

Build the project and run. To test the application inserts a record into database.

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In this article I am going to explain how to save the youtube into database and display it in Gridview using Linq. I have got a requirement to save the youtube video URL into database and display them where user can play the videos. I have created a table Tb_videos which store the information video tile, description and URL as you can see on the following :

HTML Markup:
<table>  
<tr>
<td>Title :</td>
 <td>
     <asp:TextBox ID="txttitle" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Description :</td>
 <td><asp:TextBox ID="txtdescription" runat="server" TextMode="MultiLine" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Video URL :</td>
 <td><asp:TextBox ID="txturl" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td></td>
 <td>
     <asp:Button ID="btnsubmit" runat="server" Text="Submit" /></td>
 </tr>
</table>
<br />
    <asp:GridView ID="grdvideo" runat="server" AutoGenerateColumns="False"
        BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px"
        CellPadding="4" ForeColor="Black" GridLines="Vertical">
        <AlternatingRowStyle BackColor="White" />
    <Columns>
    <asp:BoundField DataField="Title" HeaderText="Title" />
    <asp:BoundField DataField="Description" HeaderText="Description"/>
   <asp:TemplateField HeaderText="Videos">
   <ItemTemplate>
   <object  width="480" height="385">
<embed src='<%#Eval("url") %>' type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385">
</embed>
</object> 
   </ItemTemplate>
   </asp:TemplateField>
    </Columns>
        <FooterStyle BackColor="#CCCC99" />
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <RowStyle BackColor="#F7F7DE" />
        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#FBFBF2" />
        <SortedAscendingHeaderStyle BackColor="#848384" />
        <SortedDescendingCellStyle BackColor="#EAEAD3" />
        <SortedDescendingHeaderStyle BackColor="#575357" />
    </asp:GridView>

Import the namespace
C#:
using System.Text.RegularExpressions;

VB:
Imports System.Text.RegularExpressions

Create the object of DBML:
C#:
BlogDataContext db = new BlogDataContext();

VB:
Private db As New BlogDataContext()

Get the Youtube video id
Write a function to get the youtube video id from youtube video URL .

C# Code:
private string GetYouTubeVideoID(string youTubeVideoUrl)
{
    var regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*",
                       RegexOptions.IgnoreCase);
    if (regexMatch.Success)
    {
        return "http://www.youtube.com/v/" + regexMatch.Groups[1].Value +"&hl=en&fs=1";
    }
    return youTubeVideoUrl;
}

VB Code:
Private Function GetYouTubeVideoID(ByVal youTubeVideoUrl As String) As String
    Dim regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*", RegexOptions.IgnoreCase)
    If regexMatch.Success Then
        Return "http://www.youtube.com/v/" + regexMatch.Groups(1).Value + "&hl=en&fs=1"
    End If
    Return youTubeVideoUrl
End Function

Save the record to database
On button click write the below given code to insert the record into database table.

C# Code:
protected void btnsubmit_Click(object sender, EventArgs e)
{
    try
    {
        string ytFormattedVideoUrl = GetYouTubeVideoID(txturl.Text);
        Tb_Video tb = new Tb_Video();
        tb.Title = txttitle.Text;
        tb.Description = txtdescription.Text;
        tb.URL = ytFormattedVideoUrl;
        db.Tb_Videos.InsertOnSubmit(tb);
        db.SubmitChanges();
        Response.Write("<script>alert('Record Inserted Successfully');</script>");
        BindGrid();
        Clear();
    }
    catch (Exception ex)
    { }
}
public void Clear()
{
    txturl.Text = string.Empty;
    txtdescription.Text = string.Empty;
    txttitle.Text = string.Empty;
}

VB Code:
Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnsubmit.Click
    Try
        Dim ytFormattedVideoUrl As String = GetYouTubeVideoID(txturl.Text)
        Dim tb As New Tb_Video()
        tb.Title = txttitle.Text
        tb.Description = txtdescription.Text
        tb.URL = ytFormattedVideoUrl
        db.Tb_Videos.InsertOnSubmit(tb)
        db.SubmitChanges()
        Response.Write("<script>alert('Record Inserted Successfully');</script>")
        BindGrid()
        Clear()
    Catch ex As Exception
    End Try
End Sub
Public Sub Clear()
    txturl.Text = String.Empty
    txtdescription.Text = String.Empty
    txttitle.Text = String.Empty
End Sub

Fetch the record from database and display
Create a method to get the record from database table and display in Gridview data control.

C# Code:
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGrid();
    }
}

public void BindGrid()
{
    try
    {
        var bind = from v in db.Tb_Videos
                   select v;
        grdvideo.DataSource = bind;
        grdvideo.DataBind();
    }
    catch (Exception ex)
    {
    }
}

VB Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGrid()
    End If
End Sub

Public Sub BindGrid()
    Try
        Dim bind = From v In db.Tb_Videos
        grdvideo.DataSource = bind
        grdvideo.DataBind()
    Catch ex As Exception
    End Try
End Sub

Build the project and run. To test the application inserts a record into database.

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In this article I will discuss about how to use Visual Studio 2010 as a SQL Server database management studio. If you want to create applications using the .NET Framework you certainly will need Microsoft Visual Studio as IDE to build your application. If you have installed SQL Server course you will need a SQL Server Management Studio as your medium to process and manipulate data.

What if you've already installed Microsoft Visual Studio but when installing Microsoft SQL Server does not install the SQL Server Management Studio?
Of course you can not query your data right, and you can only pass the command prompt. But with Microsoft Visual SQL Management Studio as the media, you can process the data in the Microsoft Visual Studio IDE

1. Run Microsoft Visual Studio, and then open Server Explorer listed on the menu view. After that will appear Data Connection and Server.

1. 

2. Add a data connection by clicking the right mouse button and select Add Connection. Then see the database connection will appear.
3. Enter your name server as the instance name on your SQL Server, log into SQL by using the username and password to get access, or by using Windows authentication. Then select the database you want to use and then press the Test Connection button, and make sure that the connection to the database successfully.

   

4. If the Data Connection has been filled with database structure view you have, and then query the data from the database table and by right-clicking on the Data Connection that you created and select New Query.

   

5. It will display the Query Window. Then select the table you want to create the query. But not only the table that can be in the query, Views, Function and Synonims you can also query the right to suit your needs.

   

6. Once you select a table, the query functioned in accordance with the display data or you can write a query that you want on the bottom. To be able to execute the query, you can click the Execute button or by pressing the F5 key

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In this tutorial, let me show you how to remove data from string in which data are separated by delimiter. An identifier that complies with all the rules for the format of identifiers can be used with or without delimiters. An identifier that does not comply with the rules for the format of regular identifiers must always be delimited.

Delimited identifiers are used in these situations:

• When reserved words are used for object names or portions of object names.

  It is recommended that reserved keywords not be used as object names. Databases upgraded from earlier versions of Microsoft® SQL Server™ may contain identifiers that include words not reserved in the earlier version, but are reserved words for SQL Server 2000. You can refer to the object using delimited identifiers until the name can be changed.

• When using characters not listed as qualified identifiers.

  SQL Server allows any character in the current code page to be used in a delimited identifier; however, indiscriminate use of special characters in an object name may make SQL statements and scripts difficult to read and maintain.

You can use the following code:   

CREATE FUNCTION [dbo].[DistinctList] 
    ( 
    @List VARCHAR(MAX), 
    @Delim CHAR 
    ) 
    RETURNS 
    VARCHAR(MAX) 
    AS 
    BEGIN 
    DECLARE @Return_List [varchar](max); 
    DECLARE @Temp_Str [varchar](max); 
    DECLARE @Char_index int; 
    SET @List=@List+@Delim; 
    SET @Return_List=''; 
    SET @Char_index=CHARINDEX(@Delim,@List,1); 
    WHILE @Char_index>0 
    BEGIN 
    SET @Temp_Str=SUBSTRING(@List,1,@Char_index-1); 
    SET @Return_List=@Return_List+@Temp_Str+@Delim; 
    SET @List=REPLACE(@List,@Temp_Str+@Delim,''); 
    SET @Char_index=CHARINDEX(@Delim,@List,1); 
    END 
    Return SUBSTRING(@Return_List,1 ,LEN(@Return_List)-1); 
    END  

In this function first parameter take the string  and second parameter the delimiter ,on the behalf of this delimiter we split the string and remove the duplicate data.
    DECLARE @String [varchar](max); 
    SET @String='10,11,12,10,11'; 
    SELECT dbo.DistinctList(@String,',') AS List; 

And here is the output:
10,11,12

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Today let me explain you about how to make an Index on #temp tables. #Temp tables are much like SQL tables that are defined and stored in TempDB. Difference between them and a permanent table is they are not allowed to have foreign keys.

One of the feature of temp table (#temp) is that we can add a clustered or non clustered index. Also, #temp tables allow for the auto-generated columns (fields) to be created. This can help the optimizer when determining the number of records. Below is an example of creating both a clustered and non-clustered index on a temp table.
-- creating temp table - #employees
CREATE TABLE #Employees 
( 
ID INT IDENTITY(1,1), 
EmployeeID INT, 
EmployeeName VARCHAR(50) 
) 

INSERT INTO #Employees 
( 
EmployeeID, 
EmployeeName 
) 
SELECT 
EmployeeID = e.EmployeeID 
,EmployeeName = e.EmployeeName 
FROM dbo.Employees e 
 
-- creating clustered index 
CREATE CLUSTERED INDEX IDX_C_Employees_EmployeeID ON #Employees(EmployeeID)
 
-- creating non-clustured index 
CREATE INDEX IDX_Users_UserName ON #Employees(EmployeeName) 

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In this topic, I will show you how to collect value of performance counters from query analyzer. Microsoft® SQL Server SQL Query Analyzer is a graphical tool that allows you to:

• Create queries and other SQL scripts and execute them against SQL Server databases. (Query window)
• Quickly create commonly used database objects from predefined scripts. (Templates)
• Quickly copy existing database objects. (Object Browser scripting feature)
• Execute stored procedures without knowing the parameters. (Object Browser procedure execution feature)
• Debug stored procedures. (T-SQL Debugger)
• Debug query performance problems. (Show Execution Plan, Show Server Trace, Show Client Statistics, Index Tuning Wizard)
• Locate objects within databases (object search feature), or view and work with objects. (Object Browser)
• Quickly insert, update, or delete rows in a table. (Open Table window)
• Create keyboard shortcuts for frequently used queries. (custom query shortcuts feature)
• Add frequently used commands to the Tools menu. (customized Tools menu feature)

The following code is demo query to do same. You can create collect any counter vale for instant. Now write the code:

/*************************************************/
USE Master
GO
Create Table Perfmon (Object_name Varchar (200),
Counter_name varchar (300) , Instance_name varchar (100),
cntr_value bigint, cntr_type bigint , date varchar (20))
GO
Insert into Perfmon
SELECT object_name , counter_name , instance_name , cntr_value, cntr_type
, convert (varchar (20),getdate () , 120) as date
FROM sys.dm_os_performance_counters
WHERE OBJECT_NAME in
(
'MSSQL$Servername:Databases' ,
'MSSQL$Servername:General Statistics',
'MSSQL$Servername:Buffer Manager' ,
'MSSQL$Servername:Locks'
)
AND counter_name in
(
'Transactions/sec' ,'User Connections','Page life expectancy',
'Buffer cache hit ratio', 'Buffer cache hit ratio base' ,
'Free pages','Total pages','Target pages','Lock Wait Time (ms)'
)
Select @@servername
GO
Select *, case
when cntr_type  = 65792  Then 'instant_value'
when cntr_type = 272696576 Then 'Incremental'
When cntr_type = 1073939712 Then 'Instant fraction'
When cntr_type = 537003264 Then 'Use this with Base value'
else 'null' end 
from Master.dbo.perfmon
/*************************************************/

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You probably already know that string comparison is dependent on the collation. but sometimes this dependency is slightly strange. I have installed an SQL Server with LATIN1_GENERAL_CI_AS as default collation (like is also the default setting during installation). Some weeks ago I came across a specific behavior in combination of this collation and the german language.

German is a stunning language! really. You may know that we have a tendency to Germans have some special vowels (the “Umlaut”: ä, ö, and ü) and also that extra ß which is often (but not always) simply interchangeable with “ss”. look at this query that uses the default collation for comparison:
select case
 when 'ss' collate latin1_general_ci_as
     = 'ß' collate latin1_general_ci_as
      then 'Yes'
 else 'No'
end [ss=ß?]

Considering that LATIN1_GENERAL_CI_AS is the default collation, the query above is identical to the following query:
select case
 when 'ss' = 'ß' then 'Yes'
 else 'No'
end [ss=ß?]

In both cases the result is Yes, so “ß” is considered as to be identical to “ss” when using the LATIN1_GENERAL_CI_AS collation. Now it's time to look at this query:

select case
 when 'ä' = 'ae' then 'Yes'
 else 'No'
end [ä=ae?]

This time the answer is no which is somewhat surprising, since one could consider the overall behavior inconsistent. In German, “ä” and “ae” (and also “ö” and “oe” in addition as “ü” and “ue”) are just as interchangeable as “ß” and “ss”. When this happened to me, I started browsing books online. There’s a hint, where you're advised setting the default collation to LATIN1_GENERAL_BIN for new installations. I didn’t know this so far, but ok: let’s retry our experiment:

select case
 when 'ss' collate latin1_general_bin
     = 'ß' collate latin1_general_bin
      then 'Yes'
 else 'No'
end [ss=ß?]

Now the answer is no. but considering the fact that most newer installations use LATIN1_GENERAL_CI_AS, simply because that’s the default during installation, I can’t just change the collation to LATIN1_GENERAL_BIN, since this will certainly produce other problems with queries spanning multiple databases with totally different collations. Not taking into account that changing the collation for an existing server and all of its databases/columns is a cumbersome and also very risky task on its own.

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In this tutorial, I will show you how to Return Value in SQL Server  from EXEC Function. If you specify the OUTPUT keyword for a parameter in the procedure definition, the procedure can return the current value of the parameter to the calling program when the procedure exits. The following Stored Procedure is used which returns an Integer value 1 if the StudentId exists and 0 if the StudentId does not exists.

CREATE PROCEDURE CheckStudentId 
@StudentId INT 
AS 
BEGIN 
SET NOCOUNT ON; 
DECLARE @Exists INT 
IF EXISTS(SELECT StudentId FROM Students WHERE StudentId = @StudentId) 
BEGIN 
SET @Exists = 1 
END 
ELSE 
BEGIN 
SET @Exists = 0 
END 
RETURN @Exists 
END 

Returned value from EXEC function:
The returned integer value from the Stored Procedure, you need to make use of an Integer variable and use along with the EXEC command while executing the Stored Procedure.

    DECLARE @ReturnValue INT 
    EXEC @ReturnValue = < Store Procedure Name > < Parameters > Select @ReturnValue 
    Example: DECLARE @ReturnValue INT 
    EXEC @ReturnValue = CheckStudentId 34 
    SELECT @ReturnValue 

If There are valid StudentId then Output will be : 1

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