Miscellaneous

Technical Article

Calculate distance between two points

  • Script

The calculation of distance between two points using standard spherical geometry can be inaccurate for short distances (ten miles or less) because the sine function of very small angles approaches zero. The haversine approach (http://en.wikipedia.org/wiki/Haversine_formula) turns this around, so it is very accurate at small distances but has larger errors (about ten miles) for points […]

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2006-05-18 (first published: )

697 reads

Technical Article

Determine Distance Between Any Two Locations

  • Script

This function allows you to calculate the distance in miles or kilometers between any two points on the earth. I created to calculate the distance between two zip codes but is can be used for any two coordinates for which latitude and longitude is known.NOTE: A database for the coordinates of any US postal code […]

(4)

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2006-04-25 (first published: )

1,277 reads

Technical Article

Update a table column with a sequence number v3

  • Script

Both Sachinvaishnav and Mark Chad have submitted scripts to populate a column with a sequence number. The first solution uses a cursor; the second uses the SQL 2005 ROW_NUMBER() function.v1:http://www.sqlservercentral.com/scripts/viewscript.asp?scriptid=1643v2:http://www.sqlservercentral.com/scripts/viewscript.asp?scriptid=1664Since neither script requires a specific order for the sequence number, the same result can be achieved with a single UPDATE statement.

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2006-04-26 (first published: )

400 reads

Technical Article

Securing Your WCF Service

  • Article

In this article I will show you how you can implement security on a WCF service. There are many options and extensibility points for implementing security in WCF. You can also use specific products, such as the Windows 2003 Server Authorization Manager, together with WCF to implement the authorization requirements of a solution. Out of the box, WCF supports Windows credentials, Username Tokens and X.509 Digital Certificates as security credentials.

2006-04-03

1,557 reads

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Question of the Day

Restoring On Top I

I am doing development work on a database and want to keep a backup so I can reset my database. I make some changes and want to restore over top of my changes. When I run this code, what happens?

USE Master
BACKUP DATABASE DNRTest TO DISK = 'dnrtest.bak'
GO

USE DNRTest
GO
CREATE TABLE MyTest(myid INT)
GO
USE master
RESTORE DATABASE DNRTest FROM DISK = 'dnrtest.bak' WITH REPLACE

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