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

Determining Week Number of Month in a Calendar Table

The provided calendar table lacks information about the week number within a month. This article aims to address this issue by explaining how to calculate the week number for each date entry.

The table schema involves pertinent columns such as FullDateAlternateKey, DayNumberOfMonth, and WeekNumberOfYear. To derive the week number of month, we employ the following steps:

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

This SQL statement calculates the week number of the month by finding the number of weeks between the start of the month (using DATEADD(MONTH, DATEDIFF(MONTH, 0, FullDateAlternateKey), 0)) and the given date (FullDateAlternateKey). The result is incremented by 1 to reflect the week number accurately.

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