create table with dynamic constraint

I am trying to create a table with the type of constraint I don't see in any
of the help resources.
Say the basic table structure for table t1 is (colType int, colDesc
varchar(10), colMiscellaneous varchar(100))
I want to limit the combination colType-colDesc thusly:
If the combination is new, it's okay.
If the combination is exactly the same as one previously used, it's okay.
If the colDesc is the same as one previously entered, but the colType is
different, the constraint is violated and the insert or update operation
aborts.
Is this even doable? I've used multi-column constraints before, but not in
this way.
Thanks in advance,
DaveIn t-SQL, you cannot have a query expression in a CHECK constraint, so
multi-row checks are not easy to implement declaratively. You can have a
scalar UDF in certain cases, but it might fail for UPDATE operations. So one
option is to use a trigger like:
CREATE TRIGGER trg ON t1 FOR INSERT, UPDATE
AS
IF @.@.ROWCOUNT <> 0 RETURN
IF EXISTS ( SELECT * FROM inserted i
WHERE EXISTS ( SELECT * FROM t1
WHERE t1.type = i.type
AND t1.descr <> i.descr )
) ROLLBACK
... -- add any error messages if needed.
Anith|||>> IF @.@.ROWCOUNT <> 0 RETURN
should be = 0 to see if there are any rows affected
Anith|||Dave,
I think an easier solution here would be to maintain two tables:
create table cols (
colType int not null primary key,
colDesc varchar(10)
)
create table colMisc (
colType int not null references cols(colType),
colMiscellaneous varchar(100)
)
This enforces the data integrity you want:
A single colType cannot have more than one description
A colMiscellaneous value must be associated with a colType and colDesc
You could preserve an interface like you have by creating a view to match
your current table, on which there is an INSTEAD OF trigger to perform
the one or two insert statements needed for each addition of a
colMiscellaneous
value. It may not seem like less work to do this, but it avoids what you're
awkwardly doing now, which is storing facts like "the description of
column #N
is blahblah" once for every colMiscellaneous value there happens to be
for that
column.
In the long run, what you're doing will likely get you into trouble that
you have to solve with more awkwardness, like by adding DISTINCT
to queries that shouldn't need it.
Steve Kass
Drew University
Dave wrote:

>I am trying to create a table with the type of constraint I don't see in an
y
>of the help resources.
>Say the basic table structure for table t1 is (colType int, colDesc
>varchar(10), colMiscellaneous varchar(100))
>I want to limit the combination colType-colDesc thusly:
>If the combination is new, it's okay.
>If the combination is exactly the same as one previously used, it's okay.
>If the colDesc is the same as one previously entered, but the colType is
>different, the constraint is violated and the insert or update operation
>aborts.
>Is this even doable? I've used multi-column constraints before, but not in
>this way.
>Thanks in advance,
>Dave
>
>|||That is an excellent point, and one that I had considered. However, there
really are only three columns, this is just an ancillary table of about 50
rows that will not get many hits, and there will be only one routine for
each of the operations (SELECT, INSERT, UPDATE, & DELETE). I was also just
curious how I would accomplish such a task.
I do know enough about normalization to recognize your solution is
theoretically better; in this case I think the fewer tables factor will
outweigh the drawbacks you point out.
Thanks,
Dave
"Steve Kass" <skass@.drew.edu> wrote in message
news:%23S36LBWbFHA.3384@.TK2MSFTNGP09.phx.gbl...
> Dave,
> I think an easier solution here would be to maintain two tables:
> create table cols (
> colType int not null primary key,
> colDesc varchar(10)
> )
> create table colMisc (
> colType int not null references cols(colType),
> colMiscellaneous varchar(100)
> )
> This enforces the data integrity you want:
> A single colType cannot have more than one description
> A colMiscellaneous value must be associated with a colType and colDesc
> You could preserve an interface like you have by creating a view to match
> your current table, on which there is an INSTEAD OF trigger to perform
> the one or two insert statements needed for each addition of a
> colMiscellaneous
> value. It may not seem like less work to do this, but it avoids what
you're
> awkwardly doing now, which is storing facts like "the description of
> column #N
> is blahblah" once for every colMiscellaneous value there happens to be
> for that
> column.
> In the long run, what you're doing will likely get you into trouble that
> you have to solve with more awkwardness, like by adding DISTINCT
> to queries that shouldn't need it.
> Steve Kass
> Drew University
> Dave wrote:
>
any

Create Table

Can i create a table using the structure of an existing table, instead of defining the columns one by one?

e.g.
I already have table1(col1 int,col2 char(3))

I want to create another table with the same structure as table 1 without doing the following:
create table table2(col1 int,col2 char(3))

Is there a command of doing create table2 as table1 let say?Depending on the size of the table you could do the following:

select * into newtable from oldtable|||if you don't want to include data in newtable, you should modify the query as below:

select * into newtable from oldtable where 0=1|||Just what I was going to add:

If you want table structure and data then

select * into newtable from oldtable

else

select * into newtable from oldtable where (statement is false)

Create Table

Hi All
how can I Create Table (COPY STRUCTURE TO TableName Only ) From Another
Table In The Same Database
ThanksSELECT *
INTO newTable
FROM oldTable
WHERE 1 = 0;
Better yet, store your CREATE TABLE scripts in source control instead of
relying on this. Because you will not get any indexes, constraints, keys,
identity properties, statistics, extended properties, etc.
A
"TAHA" <TAHA105@.HOTMAIL.COM> wrote in message
news:uUamQAzBGHA.344@.TK2MSFTNGP11.phx.gbl...
> Hi All
> how can I Create Table (COPY STRUCTURE TO TableName Only ) From Another
> Table In The Same Database
> Thanks
>
>|||Thank you Aaron
"Aaron Bertrand [SQL Server MVP]" <ten.xoc@.dnartreb.noraa> wrote in message
news:OuEgpGzBGHA.984@.tk2msftngp13.phx.gbl...
> SELECT *
> INTO newTable
> FROM oldTable
> WHERE 1 = 0;
> Better yet, store your CREATE TABLE scripts in source control instead of
> relying on this. Because you will not get any indexes, constraints, keys,
> identity properties, statistics, extended properties, etc.
> A
>
> "TAHA" <TAHA105@.HOTMAIL.COM> wrote in message
> news:uUamQAzBGHA.344@.TK2MSFTNGP11.phx.gbl...
>

Create relationship programmatically

Hi,
I have metadata that stored my table structure and relationship. I would like to know is it possible to create table relationship programatically? Any sample?

Thank you

Something like this should work for you:

Code Snippet

CREATE TABLE MyTable
( Column1 int,
Column2 varchar(n)
FKCol3 int REFERENCES MyOtherTable(MyPKColumn)
)

For complete syntax, refer to Books Online, Topic: 'CREATE TABLE'

create NorthWind Sample Database

hi
i have the instnwnd.sql with the structure of NorthWind Sample Database. How
can i import it?
The original database was deleted.
thx
Use OSQL and specify the file name using the /i parameter.
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
"msnews.microsoft.com" <visperas1@.hotmail.com> wrote in message news:uE9kYeAOEHA.1456@.TK2MSFTNGP09.phx.gbl...
> hi
> i have the instnwnd.sql with the structure of NorthWind Sample Database. How
> can i import it?
> The original database was deleted.
> thx
>
|||Use osql or open the file in Query analyzer (isqlw) and run the .sql file
using F5.
HTH,
Vinod Kumar
MCSE, DBA, MCAD, MCSD
http://www.extremeexperts.com
Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techinf...2000/books.asp
"msnews.microsoft.com" <visperas1@.hotmail.com> wrote in message
news:uE9kYeAOEHA.1456@.TK2MSFTNGP09.phx.gbl...
> hi
> i have the instnwnd.sql with the structure of NorthWind Sample Database.
How
> can i import it?
> The original database was deleted.
> thx
>
|||Alternately, there is a free (for personal use) tool at our site (MSDE
Manager) that you can use for this and other management options. Hope you
find it useful.
HTH,
Greg Low (MVP)
MSDE Manager SQL Tools
www.whitebearconsulting.com
"Vinodk" <vinodk_sct@.NO_SPAM_hotmail.com> wrote in message
news:%23LMH1nBOEHA.268@.TK2MSFTNGP11.phx.gbl...
> Use osql or open the file in Query analyzer (isqlw) and run the .sql file
> using F5.
> --
> HTH,
> Vinod Kumar
> MCSE, DBA, MCAD, MCSD
> http://www.extremeexperts.com
> Books Online for SQL Server SP3 at
> http://www.microsoft.com/sql/techinf...2000/books.asp
>
> "msnews.microsoft.com" <visperas1@.hotmail.com> wrote in message
> news:uE9kYeAOEHA.1456@.TK2MSFTNGP09.phx.gbl...
> How
>

Create new database based on a template using SMO

Hi All,

I'm working on a web application where the user needs to be able to create and name new databases that are identical in structure to other existing databases (that is, all tables, stored procedures, functions, indexes, etc.). This is so that they can create a new database for each client and need to be able to do this through the web application. Having hunted around a fair bit, I've established that SMO is capable of doing pretty much everything that I want. The only problem is that everything I do seems to be based on the actual SQL Server and associated databases rather than the ones I have created in the App_Data folder.

The relevant code (so far) is:

Dim sqlServerAs New Server()With sqlServer.ConnectionContext .ServerInstance ="(local)" .Connect() .Disconnect()End WithFor Each dbAs DatabaseIn sqlServer.Databases ListView1.Items.Add(db.Name)NextDim newDatabaseAs New Database(sqlServer, DbName.Text.ToString)newDatabase.Create()

This does actaully create a new database, just not where I want it! Can anyone point me in the right direction as to how I can create a copy of a database in the App_Data folder?

Thanks & regards,

Paul

One general question first, will the server be running nothing but these databases? If so you may well be able to simplify the process by creating a template database within the model database. When a new database is created, it will be populated using objects in model.

The second issue is one of security as effectively sa permissions are required to create a new database. Your security concerns may be insufficient for this to be an issue, however you would be well advised to employ a level of indrection. Instead of letting the users directly trigger the create process, set up a queue table in a suitable location and have a windows service monitor this queue and create a database as required.

To find out what is required in the way of TSQL, just generate a database create script for an existing database inside (Enterprise Manager for SQL2000 and SQL Server Management Studio for SQL2005).

|||

Hi,

Thank you for your reply. I appreciate any help as I've struggled on this whole problem for a couple of days and making very little progress...

Anyway, at the moment the SQL Server is only being used for the client databases in this application, but I don't know how long that will continue to be the case.

As for the security issue, only Administrators on the Active Directory account will ultimately be able to access the page for creating databases. At the moment I'm just using site security, but will be changing this later to Active Directory.

I had already created a script file, but as this was several thousand lines, I'm rather hoping for a more manageable solution!

Thanks again,

Paul

|||Are you able to use multiple SQL Instances on that server? If so create an instance just for this application and you could use the model approach. I am glad that you have already considered security - for many applications, secuirity is an afterthought if it is thought of at all.|||

Hi,

I know that I should know, but I have no idea if I can create multiple instances of the server or not. Assuming that I can, what exactly is the model approach? How do I make fresh copies of the amended 'Model' database?

Thanks again,

Paul

Create Mining Structure and Mining Model with code

Dear friends,

I encounter a serious problem.

I would like to develop an application that can create Data Mining structures and a mining model in SQL Server 2005 with VB.NET. I tried the code from book Data Mining with SQL server 2005 in chapter 14 but did not work. Any good idea?

Please help me.

Best regards,

Manolis

Can you post the errors you're seeing?

Some of the AMO objects/methods changed slightly in the final release (this book was based on pre-release APIs). The C# sample here should help you diagnose the errors: http://www.sqlserverdatamining.com/DMCommunity/Downloads/Links_LinkRedirector.aspx?id=78.

|||

The errata for chapter 14 (and others, ironically, including how to get to this site) is at http://www.wiley.com/WileyCDA/WileyAncillary/productCd-0471462616.html

|||

Thank you very much for your help.

The errors that I can see in the code that you gave in your answer are the following and they are more or less the same as I had previously

I tried the code but initially I have encounter the following problems.

1. In any line that have the declaration As Server, As Database like in

Public Function CreateDatabase(ByVal srv As Server, ByVal databaseName As String) As Database gives me the problem that type Database is not declared the same type Server is not declared and it does not give me any option.

2. In addition to that for As DataSource, As RelationalDataSource, As RelationalDataSourceView, As ScalarMiningStructureColumn, As DataSourceViewBinding, gives me the problem that type is not declared.

3. Finally in mc = New MiningModelColumn("Yearly income", Utils.GetSyntacticallyValidID("Yearly income", Type.GetType(MiningModelColumn))) is not accesible in this context because it is 'Private'.

I have some more problems but I thing that by solving the above that I referred I will solve the rest.

Thank you any way.

Best regards,

Manolis

Create Mining Structure and Mining Model with code

Thank you very much for your help.

The errors that I can see in the code that you gave in your answer are the following and they are more or less the same as I had previously

I tried the code but initially I have encounter the following problems.

1. In any line that have the declaration As Server, As Database like in

Public Function CreateDatabase(ByVal srv As Server, ByVal databaseName As String) As Database gives me the problem that type Database is not declared the same type Server is not declared and it does not give me any option.

2. In addition to that for As DataSource, As RelationalDataSource, As RelationalDataSourceView, As ScalarMiningStructureColumn, As DataSourceViewBinding, gives me the problem that type is not declared.

3. Finally in mc = New MiningModelColumn("Yearly income", Utils.GetSyntacticallyValidID("Yearly income", Type.GetType(MiningModelColumn))) is not accesible in this context because it is 'Private'.

I have some more problems but I thing that by solving the above that I referred I will solve the rest.

Thank you any way.

Best regards,

Manolis

---

PhD student

I think you need to add a reference to Microsoft.AnalysisServices (shows up as Analysis Management Objects in the Add References dialog) and then you need to add the statement

using Microsoft.AnalysisServices;

to the top of your c# file