SQL "How To's" Part 3

Wednesday Sep 12th 2001 by Sumit Dhingra

When working with SQL, how many times have you come to a situation where you've wondered 'How do I do this?'. It could save you lot of time and frustration to be able to consult a handy resource for quick, helpful answers to common questions. Sumit Dhingra's latest article continues as part three in a series designed to serve as such a reference resource.

Hi guys. I am back again with SQL "How To's" Part III. As a recap, this series of articles is an attempt to begin a reference material that saves you a lot of time and frustration in situations where you might wonder "How do I do this?". It's my hope that this resource will help provide quick and helpful to-the-point answers to common SQL Server questions. So, I hope you will find this third part to be as useful as Parts I and II.

1) How to move Master Database

Moving a Master database is different from moving a User database. Last week, in "How To's" 2 we saw how to move User database. Now lets see how to move a Master database.

»         Right-click the SQL Server in Enterprise Manager and click Properties on the shortcut menu.

»         Click the Startup Parameters button and you see the following entries:


-d is the fully qualified path for the master database data file.
-e is the fully qualified path for the error log file.
-l is the fully qualified path for the master database log file.

»         Remove these values and specify the new values. For example :


Note : You can specify a new path for the error log file as well.

»         Stop SQL Server.
»         Copy the Master.mdf and Mastlog.ldf files to the new location (E:\Sqldata).
»         Restart SQL Server.

2) How to Rename a Server

»         Rename the physical server.

»         Reboot the server.

»         Run the SQL Server setup program. This will change the Registry entries. The setup will prompt you to "Upgrade" SQL Server. Choose "yes".

»         Reboot the server.

»         Connect to the new server name in Query analyzer.

»         Run this code: sp_dropserver <old server name>

»         Run this code: sp_addserver <new server name>, local

»         Add the entry for the new Server name in Enterprise manager and delete the entry for the Old server name.

3) How to detect & rectify Orphaned Users in a Database

Logins are associated to users by the security identifiers (SIDs), which are stored in the Master database. When you restore a database to a different server, the SID may be different resulting in a mismatch between the Login-User association. These users, without a valid login association, are called 'Orphaned Users'.

Here's how you can Detect Orphaned Users :-

Use Northwind
sp_change_users_login 'Report'

To associate a Orphaned User with a Login :-

Use Northwind
sp_change_users_login 'update_one', 'username', 'loginname'

4) How to use a Stored procedure as a Derived Table

Here's a code sample which uses the recordset returned by the execution of a stored procedure as a derived table.

SELECT a.pub_id, b.pub_name, a.title_id, a.price, a.pubdate
FROM OPENROWSET('SQLOLEDB','servername'; 'username'; 'password',
'exec Pubs.dbo.reptq1') AS a
inner join publishers b
on a.pub_id = b.pub_id

5) How to Generate Serial Numbers in a Query

create table #Fruits
(Fruit Varchar(25))

INSERT #Fruits (Fruit)
VALUES ('Mango')
INSERT #Fruits (Fruit)
VALUES ('Apple')
INSERT #Fruits (Fruit)
VALUES ('Banana')
INSERT #Fruits (Fruit)
VALUES ('Grapes')

select Sno=count(*), a1.Fruit
from #Fruits a1 INNER JOIN #Fruits a2
ON a1.Fruit >= a2.Fruit
group by a1.Fruit
order by [Sno]

Any comments or suggestions are welcome at sumitdig@hotmail.com.

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