LIKE and NULLs

Logic Precedence

Temporary table in a batch

The Performance of the T-SQL Window Functions

Window Functions in SQL greatly simplify a whole range of financial and statistical aggregations on sets of data. Because there is less SQL on the page, it is easy to assume that the performance is better too: but is it? Dwain gets out the test harness to investigate.

Sending a Variable Number of Elements in a Parameter

What are your options for sending a variable number of choices in a parameter to a stored procedure? Alex Grinberg looks at three techniques you can use.

Finding “Active” Rows for the Previous Month (SQL Spackle)

SQL Server MVP Jeff Moden walks us through the classic problem of finding all the "Active" rows for the previous month using start and end dates. This is excellent for those new to T-SQL.

Calculating Duration Using DATETIME Start and End Dates (SQL Spackle)

It's an old problem with a solution that's nearly as old. SQL Server MVP Jeff Moden shows us the old trick mixed with a slick trick to format the duration as extended hours, minutes, seconds, and milliseconds.

Filtered Index vs Indexed View

Dynamic Management Functions

Unravel Some Complex IF Logic