NULL in SQL Server is not zero and not an empty string. It means the value is unknown, and that changes every comparison you write. Why equals never matches, the NOT IN trap that returns nothing, and where NULL is allowed to live.
Testing an Application for SQL Injection
Testing an application for SQL injection on a safe copy reveals response clues and unsafe query construction before repair.
Collecting Server Facts Into One Table Every Night
Collect Server Facts each night to track SQL Server versions, settings, databases, and file sizes in a practical history table.
Replacing @@ERROR Checks With TRY CATCH in Old Procedures
Replace fragile @@ERROR checks with TRY CATCH, transaction state checks, and THROW while preserving clear failure information for callers.
SQL SERVER – Script/Function to Find Last Day of Month
A one line DATEADD query to find the last day of month for any date. It handles leap years: February 2008 gives the 29th and 2007 the 28th.
SQL SERVER – ASCII to Decimal and Decimal to ASCII Conversion
In this blog post we will see how we can convert ASCII to Decimal and Decimal to ASCII. In simple words, we will see the decimal and ASCII conversion.
SQL SERVER – Math Functions Available in SQL Server
One list of the Math Functions available in SQL Server, from ABS and CEILING to SQRT and TAN, and why RAND is the only nondeterministic one among them.
SQL SERVER – 2005 Understanding Trigger Recursion and Nesting with examples
How trigger recursion and nesting work in SQL Server 2005: triggers nest up to 32 levels, recursive triggers fire themselves, and both can be turned off.
SQL SERVER – 2005 – SSMS Change T-SQL Batch Separator
A big script used EndBatch instead of GO. Rather than a risky mass replace, I changed the Batch Separator in SSMS under Tools, Options, and it ran as is.
SQLAuthority News – Limited Edition T-Shirts Arrived
The limited edition T-shirts from SQLAuthority.com arrived, and a few loyal readers get theirs tomorrow. Thank you for all your emails and suggestions.