Self-Indexing Keys - How Do I Implement?
Feb 8, 2008
Hello All,
I am totally new to MS SQL and need some help. Finding the so called "help" not very helpful, surprisingly Google not turning up much either, maybe not doing using the right search criteria?
I am using MS SQL Server Express 2005.
What I want to do is when a user adds a grower to the GrowerList (via an ASP.NET page) it is done so that the GrowerID increments automatically to the next unique number (currently set GrowerID as primary key, type int).
This is how the table looks so far:
GrowerID
GrowerName
1
Agrico
2
AOAL
3
Bannerton Park
4
Max Frender
5
OFM
6
Timber Corp
7
Wayne Overall
8
Wayne/ AOAL
Anyone know how to do this?
Thank you.
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Dec 28, 2007
Hi Guyz
it is taken from SQL2K5 SP2 readme.txt. Anyone have idea what to do to implement this ?
Our sp2 is failing. we suspect the above problem and researching it.we are running on default instance of SQL2K5 on win2003 ent sp2
"When you apply SP2, Setup upgrades system databases. If you have implemented restrictions on the ALTER DATABASE syntax, this upgrade may fail. Restrictions to ALTER DATABASE may include the following:
Explicitly denying the ALTER DATABASE statement.
A data definition language (DDL) trigger on ALTER DATABASE that rolls back the transaction containing the ALTER DATABASE statement.
If you have restrictions on ALTER DATABASE, and Setup fails to upgrade system databases to SP2, you must disable these restrictions and then re-run Setup."
thanks in advance.
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Sep 22, 2006
Hi
I want to know is a flat file faster than a RDBMS for indexing for example a search engine indexing would a flat file be better in terms of performance, scalability etc than a RDBMS?
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Sep 10, 2007
Hi,
The other day we tried online re-indexing feature of SQL 2005 and it€™s performing faster than offline re-indexing. Could you please validate if it€™s supposed to do be this way? I always thought offline should be faster than online.
Thanks,
Ritesh
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Apr 11, 2006
Hello again,
I'm going through my tables and rewriting them so that I can create relationship-based constraints and create foreign keys among my tables. I didn't have a problem with a few of the tables but I seem to have come across a slightly confusing hiccup.
Here's the query for my Classes table:
Code:
CREATE TABLE Classes
(
class_id
INT
IDENTITY
PRIMARY KEY
NOT NULL,
teacher_id
INT
NOT NULL,
class_title
VARCHAR(50)
NOT NULL,
class_grade
SMALLINT
NOT NULL
DEFAULT 6,
class_tardies
SMALLINT
NOT NULL
DEFAULT 0,
class_absences
SMALLINT
NOT NULL
DEFAULT 0,
CONSTRAINT Teacher_instructs_ClassFKIndex1 FOREIGN KEY (teacher_id)
REFERENCES Users (user_id)
)
This statement runs without problems and I Create the relationship with my Users table just fine, having renamed it to teacher_id. I have a 1:n relationship between users and tables AND an n:m relationship because a user can be a student or a teacher, the difference is one field, user_type, which denotes what type of user a person is. In any case, the relationship that's 1:n from users to classes is that of the teacher instructing the class. The problem exists when I run my query for the intermediary table between the class and the gradebook:
Code:
CREATE TABLE Classes_have_Grades
(
class_id
INT
PRIMARY KEY
NOT NULL,
teacher_id
INT
NOT NULL,
grade_id
INT
NOT NULL,
CONSTRAINT Grades_for_ClassesFKIndex1 FOREIGN KEY (grade_id)
REFERENCES Grades (grade_id),
CONSTRAINT Classes_have_gradesFKIndex2 FOREIGN KEY (class_id, teacher_id)
REFERENCES Classes (class_id, teacher_id)
)
Query Analyzer spits out: Quote: Originally Posted by Query Analyzer There are no primary or candidate keys in the referenced table 'Classes' that match the referencing column list in the foreign key 'Classes_have_gradesFKIndex2'. Now, I know in SQL Server 2000 you can only have one primary key. Does that mean I can have a multi-columned Primary key (which is in fact what I would like) or does that mean that just one field can be a primary key and that a table can have only the one primary key?
In addition, what is a "candidate" key? Will making the other fields "Candidate" keys solve my problem?
Thank you for your assistance.
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Jul 16, 2014
what the best practice is for creating indexes on columns that are foreign keys to the primary keys of other tables. For example:
[Schools] [Students]
---------------- -----------------
| SchoolId PK|<-. | StudentId PK|
| SchoolName | '--| SchoolId |
---------------- | StudentName |
-----------------
The foreign key above is as:
ALTER TABLE [Students] WITH CHECK ADD CONSTRAINT [FK_Students_Schools]
FOREIGN KEY([SchoolId]) REFERENCES [Schools] ([SchoolId])
What kind of index would ensure best performance for INSERTs/UPDATEs, so that SQL Server can most efficiently check the FK constraints? Would it be simply:
CREATE INDEX IX_Students_SchlId ON Students (SchoolId)
Or
CREATE INDEX IX_Students_SchlId ON Students (SchoolId, StudentId)
In other words, what's best practice for adding an index which best supports a Foreign Key constraint?
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May 16, 2008
Pls let me know How I generate script for All primary keys and foreign keys in a table. Thereafter that can be used to add primary keys and foreign keys in another databse with same structure.
Also how I script default and other constraints of a table?
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Jul 15, 2002
Can somebody explain to me how to best do inserts where you have primary keys and foreign keys.l'm battling.
Is there an article on primary keys/Pk ?
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Nov 22, 2007
Hello!I have a table A with fields id,startdate and other fields. id and startdateare in the primary key.In the table B I want to introduce a Foreign key to field id of table A.Is this possible? If yes, which kind of key I have to build in table A?Thx in advance,Fritz
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Aug 13, 2007
Hi,
I have recently been looking at a database and wondered if anyone can tell me what the advantages are supporting a unique collumn, which can essentially be seen as the primary key, with an identity seed integer primary key.
For example:
id [unique integer auto incremented primary key - not null],
ClientCode [unique index varchar - not null],
name [varchar null],
surname [varchar null]
isn't it just better to use ClientCode as the primary key straight of because when one references the above table, it can be done easier with the ClientCode since you dont have to do a lookup on the ClientCode everytime.
Regards
Mike
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Apr 12, 2005
Hi all,
I had many groups of data which column A store number & column B store location. My syntax as below :-
select count(columnA) as no, columnB from table group by columnB
No columnB
20 A
10 B
5 C
How can I select 5 rows for Each ColumnB? (total 15 rows of record)
Thanks!
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Feb 29, 2008
hi friends....... I have one doubt. how can we use cursor in sql. in oracle they implement cursors on stored procedure, can we implement same concept in sql stored procedure...regards Samuel chandradoss . J
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Apr 1, 2008
Hi,
I have place an question, but in some other place in the same forum.
My apologies for that
I wanted to implement mirroring
I hereby let u know the steps
1. Created a database in Principal server named Mirror1 and one table named tblMirror1.( no values inside the table)
2. Repeated the same in Mirror in Witness
3. Selected the Principal server's database -->right click-->tasks-->mirror
4. from the left hand panel selected Options -->recovery model-->full
5. selected Mirroring from left hand panel-->configure secuirty-->entered mirror and witness name--Success
6. When I click on start mirroring I have an error stating
" Alter failed for database mirror1"
"Database mirroring cannot be enabled because Mirror1 database may have bulk logged changes that have not been backed up etc...."
7. followed this one
BACKUP database mirror1 TO DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'
got the answer as
Processed 160 pages for database 'mirror1', file 'Mirror1' on file 2.
Processed 1 pages for database 'mirror1', file 'Mirror1_log' on file 2.
BACKUP DATABASE successfully processed 161 pages in 0.318 seconds (4.147 MB/sec).
According to sources
Run a restore of this backup on your mirror.
This can be done through the GUI or using a T-SQL command.
The database restore must use the NO RECOVERY option, so the database stays in a loading state.
Also the database name on the mirror must be the exact same name as the principal
RESTORE TestMirror FROM DISK='C:Backup TestMirror_FULL.BAK' WITH NORECOVERY
Hence did the below
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
ERROR
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
HENCE MODIFIED AS
use master
go
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
Please let me know what shuld i modify
regards
cmrhema
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Sep 19, 2013
Just wondering if there was a way to implement a one is to zero or many relationship with sql or can you only have a one is to one or many?
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Jul 6, 2007
Hi all,
I've been using a piece of transact code to generate random strings of characters in a lot of scripts and I wanted to wrap it up all nice and neat into a function. I came up with the script below.
However, this fails with the following error..
quote:Invalid use of 'rand' within a function.
I've allready tried using dynamic sql and sp_executesql inside the function hoping that a new scope would let me use rand() but that isn't allowed either.
I'm Using sql server 2000. Any ideas?
Charlie.
-- snip ----
CREATE FUNCTION dbo.randstr (
@lengthINT)
RETURNS VARCHAR
AS BEGIN
DECLARE @outputVARCHAR(8000)
DECLARE @allowedVARCHAR(8000)
SET @allowed = '234679abcdefghjkmnpqrstuvwxyz234679ACDEFGHIJKLMNPQRTUVWXYZ'
SET NOCOUNT ON
DECLARE @charmapTABLE (charpos INT IDENTITY (1,1), symbol CHAR)
DECLARE @counterINT
DECLARE @characterINT
DECLARE @maplengthINT
SET @maplength = LEN(@allowed)
SET @character = 0
SET @output = ''
-- Insert the allowed characters into the character map table
SET @counter = 1
WHILE (@counter < @maplength + 1) BEGIN
INSERT INTO @charmap SELECT SUBSTRING(@allowed,@counter,1)
SET @counter = @counter + 1
END
-- Start the loop to generate @output
SET @counter = 1
WHILE (@counter < @length + 1) BEGIN
-- RAND() should output a floating point number between 0 and 1 however...
-- Sometimes the rand() function spits out a number greater than 1
-- or the multiplication results in 0
WHILE (@character < 1) OR (@character > @maplength) BEGIN
SET @character = CAST(@maplength * RAND()+1 AS INT)
END
-- Add the random character to @output
SET @output = @output + (SELECT symbol FROM @charmap WHERE charpos = @character)
-- Increment and Reset the @character variable
SET @counter = @counter + 1
SET @character = 0
END
RETURN @output
END
-- end snip ---
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Mar 26, 2008
Want to implement replication in sql server 2005
Kindly let me know how to do it.
Please
regards
cmrhema
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May 11, 2006
Hi,
i hav a text file in this format..
currency,exchangerate(INR),date
dollar,45,20/04/2006
dollar,46,22/04/2006
britishpound,65,20/04/06
dirham,12,20/04/06..etc..
now,i want that using this as source.. 2 tables should be created and filled with appropriate data..
CurrencyMaster..Currencyid(PK),Currencyname
CurrencyDailyRate..ID,Currencyid(FK),rate,date
how can i do it using SSIS?
thks
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May 22, 2006
Greetings SQL friends!
I have the following transact SQL code which I want to change to a set of SSIS components.
SELECT blah, blah
FROM PSTAGE..[stage_OFFER_PRICE_DIVIDEND] AS SOPD
LEFT OUTER JOIN PSTAGE..[stage_PRICE_GRP] AS SPG
ON SOPD.PRICE_GRP_ID = SPG.PRICE_GRP_ID
LEFT OUTER JOIN PSTAGE..[stage_type] AS TYP
ON TYP.TYPE_CD=SPG.PRICE_TYPE_TYPE4_CD
and TYP.TYPE_CL_CD = '0017'
I know I can join two data sets using a merge join (left join) but how do I combine a third merge join? Should I be doing this or should I just stick my code in a SQL Task instead?
Your help would be appreciated.
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May 28, 2007
Hi All,
I'm very new to Integration Services. Self Learned this ETL tool based on my prior ETL tool knowledge.
Can you tell me how do write IF Then Else conditions for every column in my source and redirect to a single output?
Hey correction here ... i'm using flat file as my source
Thanks in Advance,
Suresh N
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Oct 27, 2006
My report is taking long time to display hundered of records.So we want to display 15 records per page and Next page link at the end of report.Please help me how to do this.
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Feb 1, 2007
I have a table search the record. The user can search by name, id, status, address and other information.I want to make the search function more robust. For example, when the database has a record with name = "Michael Jackson", either typing any subset of the name will show this record.I would like to know if there is any easy way to implement this with VS2005 and SQL2005 Express.Thank you
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Jun 9, 2007
I am using Visual Studio 2005 & SQL Server. How do i implement a DDL for users to select which value to input. like i can with Access. i do not need a table i think. if not the table would have only ID & Value.?
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Nov 27, 2007
Hi All,
Can i implement provider model to my business logic?
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Feb 8, 2006
using (SqlConnection oConn = new SqlConnection(sConnection))
using (SqlCommand oCommand =
this.CreateSqlCommand("rcsp_employee_f_changerole.xml", oConn))
{
try { oConn.Open(); }
catch(Exception ex)
{
p_nErrorCode =
10;
p_sErrorMessage = "Error opening database connection during
RCEmployee.DBUpdate: " + ex.Message;
goto Failed;
}
oCommand.Parameters["@employeeid"].Value = p_gID;
oCommand.Parameters["@authorityid"].Value = p_gAuthorityID;
oCommand.Parameters["@role"].Value=sNewRole;
if (!ProcessNonQuery(oCommand,
sMethodName)) goto Failed;
Failed:
if (ErrorCode > 0) bReturn =
false;
oConn.Close();
}
}
return bReturn;
p_gID, p_gAuthorityID is of type guid.
sNewRole is of type string.
I get the error " Object must implement IConvertible at
oCommand.ExecuteNonQuery(); whihch is in the function if (!ProcessNonQuery(oCommand, sMethodName))
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Jul 15, 2004
Here's a basic overview of my Table
ID identity int
ParentID int
Name varchar
Now, the root level items will have a ParentID of NULL, and the child nodes will have it's parent's ID in it's ParentID column (a simple self-referencing relationship).
However, when I select it, I would like to Order by ID, but then have all it's children right after it. For example, if this is the unsorted view:
Code:
ID ParentID Name
----------------------
1 <NULL> Test
2 1 Test Child 1
3 <NULL> Test 2
4 1 Test Child 2
5 3 Test 2 Child 1
I would like the sorted to look like:
Code:
ID ParentID Name
----------------------
1 <NULL> Test
2 1 Test Child 1
4 1 Test Child 2
3 <NULL> Test 2
5 3 Test 2 Child 1
Is this possible with my current structure? If not, how could I change it?
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Apr 14, 2008
hi friends,
Iam Executing the sp logic.suppose incase if any problem occurs inbetween execution(NO SPACE,communication failure,log full)
data is getting commited partially insteady of rollbacking entire transaction.
CREATE procedure RBI_Control_sp
as
begin
set nocount on
--Checking the count before truncating
exec fin_ods..count_sp
--Truncating the Table
exec fin_ods..trun_sp
--Data Transfer
exec fin_ods..RBI_Data_Transfer_sp
--Checking the count after Data transfer
exec fin_ods..count_sp
--temp table Table population,Fetching data from the fin_ods[erp Table]
exec FIN_wh..RBI_SPExecution_sp
set nocount off
end
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Apr 15, 2006
Hi all, I was hoping I could get some ideas about how to implement a share portfolio. Right now I've got a transaction table that lists the name of the share, quantity, amount and a few other details of every transaction I make. I think I'll be better off breaking it up into two tables; sales and purchases.
I want to create a portfolio using this data. I figured that I could set a query to show one column with names of all the shares (selected from the share purchase table) and another column to work out the current number of shares I hold. Thing is, I can't seem to work out a formula that will pick up all purchases of a certain share, then subtract of sales of the same and then place it in the column for that share in the portfolio.
There's probably a much cleaner way to do it that I'm completely missing. Any ideas? Perhaps edit the input form for the transaction table(s) so that it notes the name of the share and creates a new record if the share isn't already in the portfolio or adjusts it if it is.
And yes, I'm using Access.
Thanks
-N
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Oct 16, 2006
Using: VB.Net 2003, SQL Server 2000 and nText Column...
Examples: "Writing BLOB Values to a Database [Visual Basic]" and "Conserving Resources When Writing BLOB Values to SQL Server [Visual Basic]"
I modified the following code from the samples that were available in Help and MSDN. When my application reaches the ExecuteNonQuery statement it informs me that the Byte Array oDocument must implement IConvertible. I have even tried the extended version which uses a SQL Insert followed by UPDATETEXT with Pointers, and I get the same result with the Byte Array used in that example. My goal is to have Users Append certain documents to Proposals within my database, as I understand that is what I would be doing anyway if I used SharePoint.
Following the examples I have not trouble whatsoever reading an Image File from SQL Server 2000, and therefore I expect no trouble with nText Fields. I just cannot seem to insert Documents or Images via VB Code.
What is wrong with the examples that I cannot use the same code?
---- VB Code Follows ----
Private Sub btnSelectFile_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSelectFile.Click
Dim oSQLConnection As System.Data.SqlClient.SqlConnection
Dim oSQLCommand As System.Data.SqlClient.SqlCommand
Dim oSQLDataReader As System.Data.SqlClient.SqlDataReader
Dim oDocument() As Byte
Try
'Define the Initial Directory to be the "My Documents" Directory.
ofdAttachment.InitialDirectory = "My Documents"
'Filter for File of Word, PDF, and Text. This will suffice for now.
ofdAttachment.Filter = "Word Documents (*.doc)|*.doc|PDFs (*.pdf)|*.pdf|Text Files (*.txt)|*.txt"
'Show the Dialog to Open a File.
ofdAttachment.ShowDialog()
'If the User Selected a File then attempt to Add the Attachment.
If ofdAttachment.FileName <> String.Empty Then
'Read the Document into a Byte Array.
oDocument = GetDocumentInBytes(ofdAttachment.FileName)
'Define the Connection to the SQL Database.
oSQLConnection = New System.Data.SqlClient.SqlConnection("Persist Security Info=False;Integrated Security=SSPI;database=proposal_tracking;server=dbserverdbserver;")
'Attempt to Open the SQL Connection.
oSQLConnection.Open()
'Create a New SQL Command Object.
oSQLCommand = New System.Data.SqlClient.SqlCommand
'Assign the SQL Connection information to the SQL Command Object.
oSQLCommand.Connection = oSQLConnection
'Define the SQL Statement to Attach the Document.
oSQLCommand.CommandText = "INSERT INTO Documents (DocumentName, Document) VALUES (@DocumentName, @Document)"
oSQLCommand.CommandType = CommandType.Text
'Define the Parameters of the SQL Statement.
oSQLCommand.Parameters.Add("@DocumentName", SqlDbType.VarChar).Value = Mid(ofdAttachment.FileName, ofdAttachment.FileName.LastIndexOf("") + 2)
oSQLCommand.Parameters.Add("@Document", SqlDbType.NText, oDocument.Length).Value = oDocument
'Execut the SQL Statement. Resulting in an Error that states:
'Object must implement IConvertible.
oSQLCommand.ExecuteNonQuery()
If Not oSQLCommand Is Nothing Then
oSQLCommand.Dispose()
oSQLCommand = Nothing
End If
If Not oSQLConnection Is Nothing Then
oSQLConnection.Close()
oSQLConnection = Nothing
End If
End If
Catch sqlex As System.Data.SqlClient.SqlException
MsgBox(sqlex.Message)
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Public Shared Function GetDocumentInBytes(ByVal strFilePath As String) As Byte()
Dim ofsDocumentReader As System.IO.FileStream = New System.IO.FileStream(strFilePath, System.IO.FileMode.Open, System.IO.FileAccess.Read)
Dim obrDocumentReader As System.IO.BinaryReader = New System.IO.BinaryReader(ofsDocumentReader)
Dim oDocument() As Byte
Try
oDocument = obrDocumentReader.ReadBytes(CInt(ofsDocumentReader.Length))
obrDocumentReader.Close()
ofsDocumentReader.Close()
Return oDocument
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Function
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Oct 18, 2007
Dear All,
Is there any way to do things with filesystem in SQL 2005 ? I want to check a file and if exists I could replace data into it or create the file if not exists. I tried build a DLL file using C# to do those things and registered it in SQL 2005
but when I execute the procedure it returns an error like this below :
Msg 6522, Level 16, State 1, Procedure testfsq, Line 0A .NET Framework error occurred during execution of user-defined routine or aggregate "testfsq": System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.System.Security.SecurityException: at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() at System.IO.FileInfo..ctor(String fileName) at FSQuery.fsq()
So, is that means that we can't use another namespace in .NET framework but Microsoft.SQLServer.Server ? thanks in advance.
Best regards,
Hery
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Aug 28, 2006
i have two computers with Sql server 2000 std edition(SP4) and windows 2003 std edition(SP1).
how should i do to balance the loading of sql server and sync these two servers?
The sql server mirroring means that if one server is down, then the other one will replace it?
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Jun 4, 2015
I'm currently learning how to implement Encryption into my SQL database, and I've run into something I don't know how to explain or understand. I'm working on creating a set encryption for a set of columns in a database, and I don't know how to figure out what size the VARBINARY column needs to be. After some trial and error, I've noticed that a clear text of 9 characters needs 68 varbinary characters, 100 cleartext=148 varbinary, and 254 cleartext= 308 varbinary characters. How is the minimum number of varbinary characters calculated?Â
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Jan 9, 2006
I need to implement following flow:
[Source] - > [Split]
- [IF TRUE] -> [DO SOMETHING] - [OUTPUT TO C]
- [IF FALSE] -> [DO SOMETHING ELSE] - [OUTPUT TO C]
The issue is to come back to the same destination after conditional split.
In other words, is there something opposite to "Multicast"?
I looked at Union and Merge - but it looks like it's not for this kind of things.
Thanks.
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Dec 13, 2006
Hi,
We are planning for a DW solution based upon SQL Server 2005 EE. We will use a 64 bit machine for the Database engine and Analysis Services. Should we have seperate server for SSIS or should we use the same 64 bit box? If we go for a sepaerate server for SSIS should we use 32 bit or 64 bit ?
The primary datasources will be a new developed .NET application and a financial system based upon SQL Server 2000.
Every good advice/experiance is greatly appriciated!
Larra
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