How to Calculate the Week Number of a Month in a SQL Server Calendar Table?

Calculating Week Number of Month for a Calendar Table

In order to determine the week number of a given month for your calendar table, spanning from 2000 to 2012, utilize the following query:

update TCalendar 
set WeekNumberOfMonth = DATEDIFF(week, DATEADD(MONTH, DATEDIFF(MONTH, 0, FullDateAlternateKey), 0), FullDateAlternateKey) +1

This query accomplishes the task by:

• Using the DATEADD and DATEDIFF functions to calculate the week difference between the first day of the current month and the specified date in the FullDateAlternateKey column.
• Adding one to the resulting week difference to account for the fact that week numbers start at 1.

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