Re: Please help totally lost on syntax - Database Discussion Boards

MeterMan24-Mar-06 4:09

24-Mar-06 4:09

I have two tables that I have joined
First table is ExpenseReport and has a field in it called tboxBeginDate
Second table is called BeginDates and has a field in it also called tboxBeginDate.

I want to query and show only those dates in BeginDates that are not used in ExpensReport

Select ExpenseReport.tboxBeginDate, BeginDates.tboxBeginDate from BeginDates.tboxBeginDate RIGHT JOIN ON ExpenseReport.tboxBeginDate where BeginDats.tboxBeginDate != ExpenseReport.tboxBeginDate.

any help would be great thanks

Win32newb
"Programming is like Sex, make a mistake and you end up providing support for a long time"

Re: Please help totally lost on syntax

Michael Potter24-Mar-06 4:21

Michael Potter

24-Mar-06 4:21

Either of these should work. I prefer the first one for maintainability. If your tables are large the second one may be quicker with the correct indexes:

SELECT 
    tboxBeginDate
FROM
    BeginDates
WHERE
    tboxBeginDate NOT IN (SELECT DISTINCT
                              tboxBeginDate
                          FROM
                              ExpenseReport)

SELECT
    bd.tboxBeginDate
FROM 
    BeginDate bd
LEFT JOIN
    ExpenseReport er
    ON (bd.tboxBeginDate = er.tboxBeginDate)
WHERE
    er.tboxBeginDate IS NULL

Re: Please help totally lost on syntax

MeterMan24-Mar-06 4:36

MeterMan

24-Mar-06 4:36

thanks a bunch you wouldn't happen to have a good place "tutorial" that will help you with sql other than w3schools would you?
thanks again

Win32newb
"Programming is like Sex, make a mistake and you end up providing support for a long time"

Re: Please help totally lost on syntax

Michael Potter24-Mar-06 4:50

Michael Potter

24-Mar-06 4:50

I don't know any really good sites. You may want to look at http://www.sqlservercentral.com[^]. Sign up for their newsletter and you will get a little dose of knowledge every day.

The book I learned the most from was written by Ken Henderson: The Guru's Guide to Transact-SQL. It was tough to grasp at first but, it really gives you confidence with the SQL language.

Re: Please help totally lost on syntax

MeterMan24-Mar-06 4:43

MeterMan

24-Mar-06 4:43

When I try both of your methods it ask me to enter a value for bd.tboxBeginDate I checked the database and this table has values so I'm not sure whats wrong must be something with the join statement Frown | :(

Win32newb
"Programming is like Sex, make a mistake and you end up providing support for a long time"

Re: Please help totally lost on syntax

Michael Potter24-Mar-06 4:52

Michael Potter

24-Mar-06 4:52

I am guessing you are not using SQL server. Are you using Access?

Re: Please help totally lost on syntax

MeterMan24-Mar-06 6:25

MeterMan

24-Mar-06 6:25

Yeah unfortunately I'm using access for now. We will be converting to sql server soon but for now Access. Sorry I should have been more specific.

Win32newb
"Programming is like Sex, make a mistake and you end up providing support for a long time"

Re: Please help totally lost on syntax

Michael Potter24-Mar-06 8:39

Michael Potter

24-Mar-06 8:39

Access syntax is very different from SQL. The join syntax is really nasty when mulitple joins are involved. I used to write code that converted between the two but, that was many years ago. I think you can modify your original WHERE clause like this:

SELECT
    ExpenseReport.tboxBeginDate, 
    BeginDates.tboxBeginDate 
FROM
    BeginDates.tboxBeginDate 
LEFT JOIN ON 
    ExpenseReport.tboxBeginDate 
WHERE
    BeginDates.tboxBeginDate == ExpenseReport.tboxBeginDate AND
    ExpenseReport.tboxBeginDate IS NULL

The 'IS NULL' is what I am not sure about. Create a new query and paste this into the SQL view of the query and see if it resolves correctly by going back to the design view. I can't remember how null is resolved in Access. It might be ISNULL([Field Name]) or something like that.

Do remember the following, when NULL is directly compared with a defined value:

BeginDats.tboxBeginDate != ExpenseReport.tboxBeginDate

Your result will be NULL not TRUE as you expected. That is why you would never get the correct result.

-- modified at 14:48 Friday 24th March, 2006

Re: Please help totally lost on syntax

MeterMan25-Mar-06 12:43

MeterMan

25-Mar-06 12:43

Thanks for all your help. I was wondering about that != but yeah makes scense kinda like multiplying something by 0 it is always goning to be zero.
again thanks

Win32newb
"Programming is like Sex, make a mistake and you end up providing support for a long time"

Delete Procedure

shapper24-Mar-06 3:28

shapper

24-Mar-06 3:28

Hello,

I am creating my first procedures in SQL using SQL 2005.
I have 3 tables, with the following columns:

Surveys - [SurveyId](PK) and [SurveyName] Questions - [SurveyId](FK), [SurveyQuestionId](PK) and [SurveyQuestion] Answers - [SurveyQuestionId](FK), [SurveyAnswerId](PK) and [SurveyAnswer]

Each survay can include various questions and each question can include several answers.
This is way I am using the Foreign Keys in both Questions and Answers tables. To relate the tables.

I created a procedure which deletes a Survey given its SurveyId. This is part is done.

I also need to delete all the questions dependent on that survey and all the answers dependent on those questions.
How can I delete survey, its questions and their answers when receiving the SurveyId?

Thank You Very Much,
Miguel

Here is the code of the procedure that I created which in this moment only deletes the survey from the Surveys table:

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER PROCEDURE [dbo].[Surveys_DeleteSurvey]

-- Procedure Parameters
@SurveyId As uniqueidentifier

AS
BEGIN

-- Check if SurveyId is null
IF( @SurveyId IS NULL )
RETURN -1
ELSE
BEGIN
-- Return '-1' if a survey with SurveyId given value is not found
IF( NOT EXISTS( SELECT @SurveyId FROM dbo.Surveys WHERE @SurveyId = SurveyId ) )
RETURN -1
END

-- Delete the survey with SurveyId given value
DELETE FROM dbo.Surveys WHERE @SurveyId = SurveyId

-- Return '0' when successful
RETURN 0

END

Re: Delete Procedure

Michael Potter24-Mar-06 4:10

Michael Potter

24-Mar-06 4:10

You could just implement Cascade on Delete when you implement referencial integrity. But, I always do it the hard way also:

ALTER PROCEDURE [dbo].[Surveys_DeleteSurvey]
(
    @SurveyId As uniqueidentifier
)
AS
BEGIN
    
    -- Check if SurveyId is null
    IF( @SurveyId IS NULL )
        RETURN -1
    ELSE
    BEGIN
        -- Return '-1' if a survey with SurveyId given value is not found
        IF( NOT EXISTS( SELECT @SurveyId FROM dbo.Surveys WHERE @SurveyId = SurveyId ) )
            RETURN -1
    END
    
    -- Delete Answers
    DELETE FROM 
        dbo.Answers 
    WHERE 
        SurveyQuestionId IN (SELECT 
                                SurveyQuestionId 
                             FROM 
                                Questions 
                             WHERE
                                SurveyId = @SurveyId)
    
    -- Delete Questions
    DELETE FROM 
        QUestions
    WHERE 
        SurveyId = @SurveyId
    
    -- Delete the survey with SurveyId given value
    DELETE FROM dbo.Surveys WHERE @SurveyId = SurveyId
     
    -- Return '0' when successful
    RETURN 0
END

SQL Server over Virtual Private Network

StyleGuide24-Mar-06 0:08

StyleGuide

24-Mar-06 0:08

Hi All,

A couple of basic questions - can SQL server run over a VPN? If so, can it use Windows Password Verification? Can I use SQL Server Express? (has it network capabilities?).

I am moving from an internal networked solution, which has an Access Back end, to a scenario where workers are based around different parts of the country, so I'm thinking SQL Server is the best way forward.

I do use SQL Server over an internal network on another project, but any advice work be greatly appreciated.

Thanks

Jonny

Re: SQL Server over Virtual Private Network

Luis Alonso Ramos24-Mar-06 5:45

Luis Alonso Ramos

24-Mar-06 5:45

StyleGuide wrote:
can SQL server run over a VPN?

For apps, VPN is basically a normal network, so they can hardly tell the difference. So, SQL can run in a network that is accessed by VPN (or even be run in a VPN client and be used by other computers in the network.)

StyleGuide wrote:
Can I use SQL Server Express? (has it network capabilities?).

Yes, but they are not enabled by default. You have to go to the SQL Configuration Manager and enable the SQL Browser Service, and also enable the TCP/IP protocol.

StyleGuide wrote:
If so, can it use Windows Password Verification?

I'm not 100% sure on this one, but you should if you are part of a domain.

Luis Alonso Ramos
Intelectix
Chihuahua, Mexico

Not much here: My CP Blog!

Re: SQL Server over Virtual Private Network

StyleGuide26-Mar-06 6:21

StyleGuide

26-Mar-06 6:21

thanks Luis, thats really helpful.

Jonny

Re: SQL Server over Virtual Private Network

Luis Alonso Ramos26-Mar-06 17:47

Luis Alonso Ramos

26-Mar-06 17:47

You are welcome! I am glad I could be of help Smile | :)

Luis Alonso Ramos
Intelectix
Chihuahua, Mexico

Not much here: My CP Blog!

mrkeivan23-Mar-06 11:00

mrkeivan

23-Mar-06 11:00

hey guys, i was working on a simple login form that i get the UserID from Access database and match ir with selected password also got from that database but I get this erorr message. I just can't figure out what the problem is.

My code :

VerificationConn.Open();<br />
OleDbCommand Cmd = new OleDbCommand("Select PassCode from Password where UserID = '" + ID.Text + "'", VerificationConn);<br />
string lookupPassword = (string)Cmd.ExecuteScalar();<br />
VerificationDA.Fill(VerificationDS, "Password");<br />
VerificationConn.Close();<br />
if(lookupPassword == Pass.Text)<br />
{<br />
    //next from will be opend<br />
}

Error:
System.Data.OleDb.OleDbException was unhandled
Message="Syntax error in FROM clause."
Source="Microsoft JET Database Engine"
ErrorCode=-2147217900
StackTrace:
at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
at System.Data.OleDb.OleDbCommand.ExecuteScalar()
at Phone.Verification.button1_Click(Object sender, EventArgs e) in C:\Documents and Settings\Mr.K\My Documents\Visual Studio 2005\Projects\Phone\Phone\Verification.cs:line 38

I thank you in advance Cool | :cool:

Re: Login ID and Password

Krisky23-Mar-06 17:39

Krisky

23-Mar-06 17:39

hi,

try like this.

strSQL="SELECT passcode FROM PassWordTable WHERE Useranme=@Username AND Password=@Password"

'Add the parameters for the query

Dom ComObj as New SqlCommand(strSQL,myConnection)

ComObj.Parameters.Add("@Username",txtUserName.text.Trim())

Like that for password also.
Dim dr As SqlDataReader

dr=ComObj.ExecuteReader(CommandBehavior.CloseConnection)

Try If dr.Read() then

Response.Write("We are logged in")
FormsAuthentication.RedirectFromLoginPage(txtUserName.Text,False)

else

Response.Write("Login failed")

End Try

I hope this helps.

Regards
Bhar

Bharathi
Books for Programmers
http://www.vkinfotek.com

HEY i did what you said

mrkeivan23-Mar-06 23:21

mrkeivan

23-Mar-06 23:21

hey man thanx for your help i did exactly what you said but I still have the same error !! I have changed everything the same. the thing is I used this code somewhere else and it works perfectly but i have no i dea why it doesn't work here !!!

D'Oh! | :doh:

Re: Login ID and Password

Michael Potter24-Mar-06 4:36

Michael Potter

24-Mar-06 4:36

Are you sure Password is not a keyword in Access? Try [Password] and see if you get better results.

BTW: Why do you fill a dataset when you already have the result from the ExecuteScalar() call?

Re: Login ID and Password

Luis Alonso Ramos26-Mar-06 17:49

Luis Alonso Ramos

26-Mar-06 17:49

mrkeivan wrote:
leDbCommand Cmd = new OleDbCommand("Select PassCode from Password where UserID = '" + ID.Text + "'", VerificationConn);

Concatenating text to create SQL queries is a huge security risk. You should use parameterized queries. See this article for more information:

SQL Injection Attacks and Some Tips on How to Prevent Them[^]

Luis Alonso Ramos
Intelectix
Chihuahua, Mexico

Not much here: My CP Blog!

Visio

devfendar23-Mar-06 7:43

devfendar

23-Mar-06 7:43

Hey, two questions guys:
1. Visio - Database Model Diagram: I have two tables:

table 1 (Parent): Group {PK: GroupUIN, Attributes: Name, Desc}
table 2 (Child): User {PK: UserUIN, Attributes: ParentGroupUIN, Name, Desc}

I connected the two entities with a "Relationship". Under "Miscellaneous" tab, I specified relationship cardinality: One Group can related to "Zero or More" User. - I am having a hard to "show" cardinality in ER diagram (as supposed to just under "Miscellaneous" tab.

2. How can I generate SQL scripts from Visio ER/Database Diagrams?

Thanks.

Query the MaxLocksPerFile Count.

beatle1123-Mar-06 3:45

beatle11

23-Mar-06 3:45

I have an Algoritim in old C/CPP code that will update tables in an Access database. The database is very large and many records are affected. Unfortunately the MaxLocksPerFile Limit gets exceeded. After some research i have a bit more information. That limit can be changed in the registry. The default is 9500 locks. I was wondering if anyone knew of a way to get the current MaxLocksPerFile count. I would like to be able to see how the MaxLocksPerFile count changes as records are being modified. I would like to be able to get around this error without needing to change that limit if at all possible.More information is available at http://support.microsoft.com/kb/q173006/ if anybody else is having a similar problem. Any thoughts or ideas would be greatly appreciated.

Transfer sql server database to ms access in vb 6.0...

swirldan23-Mar-06 1:04

swirldan

23-Mar-06 1:04

Hello!

I have a problem with accomplishing task mentioned in a subject.
I want to transfer data from MS SQL server database to Ms Access database in Visual Basic.

Till this moment I only achieved to create an empty MS Access database (only structure:tables with fields, but without types). This is done with this simple code:

<br />
Set rs = dataEnv.sqlCon.OpenSchema(adSchemaTables, criteriaTables)<br />
    <br />
    While Not rs.EOF<br />
        criteriaFields(2) = rs!TABLE_NAME<br />
        Set cs = dataEnv.sqlCon.OpenSchema(adSchemaColumns, criteriaFields)<br />
            Set msTbl = msDb.CreateTableDef(rs!TABLE_NAME)<br />
            While Not cs.EOF<br />
                With msTbl<br />
                    .Fields.Append .CreateField(cs!COLUMN_NAME, dbLong)<br />
                End With<br />
                cs.MoveNext<br />
            Wend<br />
            msDb.TableDefs.Append msTbl<br />
        rs.MoveNext<br />
    Wend<br />
    msDb.Close<br />

Can anyone tell me how to copy contents of tables?

Thanks in advance!
Greetings!
Daniel

what is wrong in this code

mm31022-Mar-06 23:03

mm310

22-Mar-06 23:03

private void button1_Click(object sender, EventArgs e)
{
string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\db4.MDB";
string strSQL = "SELECT * FROM ta1";

OleDbConnection myConn = new OleDbConnection(strDSN);
OleDbDataAdapter myCmd = new OleDbDataAdapter(strSQL, myConn);
DataSet dtSet = new DataSet();

string sqlQuery = "SELECT Name,Password FROM ta1 where Name = '" + textBox1.Text.ToString() + "' AND Password= '" + textBox2.Text.ToString() + "'";

myCmd.SelectCommand.CommandText = sqlQuery;

int numberOfRowsFeched = myCmd.Fill(dtSet, "ta1");

if (numberOfRowsFeched > 0)
{
try
{
myCmd.UpdateCommand.CommandText = "UPDATE Users SET " + "Password = '" +textBox3.Text + "'" + " WHERE Name = '" + textBox1.Text + "'";
myCmd.UpdateCommand.Connection = myConn;
myCmd.UpdateCommand.ExecuteNonQuery();
MessageBox.Show("Record updated Successfully");
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
}
catch (System.Data.OleDb.OleDbException exp)
{
myConn.Close();
MessageBox.Show(exp.Message);
}

}
else
{
MessageBox.Show("wrong Name Or Password", "Password", MessageBoxButtons.OK, MessageBoxIcon.Information);
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
}

message : http://www.cpestudents.net/upload/up/54.gif[^]

Re: what is wrong in this code

albCode22-Mar-06 23:31

albCode

22-Mar-06 23:31

this keywords SET " + "Password as sql command in result is SETPassword, you have to separate by space, just set space character before Password like this

SET " + " Password

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