Explain the DATE Function ' ISOWEEK' in Tableau with Example?

 In Tableau, the ISOWEEK function is used to extract the ISO week number from a given date. It returns an integer representing the week of the year based on the ISO week numbering system.

The ISO week numbering system follows the ISO 8601 standard, where each week starts on a Monday, and the first week of the year is the week that contains the majority of days of the new year.

The syntax of the ISOWEEK function in Tableau is as follows:

ISOWEEK(date)

• date is the date value from which you want to extract the ISO week number.

Here's an example to illustrate the usage of the ISOWEEK function in Tableau:

Suppose you have a dataset with a date field called "Order Date" containing various date values. To extract the ISO week number from the "Order Date" field, you can use the ISOWEEK function as follows:

ISOWEEK([Order Date])

In this example, the ISOWEEK function is applied to the "Order Date" field. It will return an integer representing the ISO week number for each date value in the "Order Date" field.

The resulting output will be a column of integers representing the ISO week number for each corresponding date in the "Order Date" field.

The ISOWEEK function in Tableau is useful when you need to analyze or group data based on the ISO week component. You can use it to create visualizations or calculations that depend on the ISO week number, such as analyzing weekly sales performance according to the ISO week numbering system or comparing trends across different ISO weeks.