DatePart Tableau: Syntax, Usage and Easy Examples 101

Tableau is a popular Business Intelligence solution that allows you to make data-driven choices by creating interactive charts, reports, and dashboards. Tableau’s extensive set of Templates and Widgets allow you to easily analyze and visualize datasets that are imported into the Tableau workspace.

Tableau not only allows you to perform Data Visualization on imported datasets, but it also allows you to link with third-party applications by using Tableau-supported connectors or drivers to retrieve data from external data sources. Amazon Athena, an interactive query engine for analyzing Big Data, is one such external program that enables Tableau connection.

In this article, you will learn about DatePart Tableau Function, key features of Tableau, the architecture, why Date Functions are used, and the different date functions available in Tableau.

What is Tableau?

Tableau is a well-known solution for dealing with Business Intelligence (BI) and Data Analytics issues. It lets users view, analyze, and make business decisions using a variety of charts, graphs, maps, dashboards, and stories.

The database industry’s principal goal was to become more interactive and comprehensive. Tableau was later acquired by Salesforce in June 2019. Tableau’s innovation was solely centered on Visual Analysis, and it has a slew of capabilities and gives you far more control over the appearance of your visualization.

Key Features of Tableau

• Capable of handling massive amounts of Data: Tableau is capable of processing massive amounts of data, with millions of rows of data being no problem. With such a large amount of data, numerous types of visualizations may be created without slowing down the dashboards.
• Responsive Dashboard: Tableau Dashboard has a responsive dashboard feature that allows users to customize their dashboards for improved compatibility on mobile and laptop devices.
• Interactive Visualization: Tableau is a Data Visualization application that lets users do complex computations, data mixing, and dashboarding to generate visually appealing data visualizations. Users can also rapidly create an interactive display using drag-and-drop capabilities
• Connection and Sharing: Tableau has several advanced features, including Data Dissemination and Collaboration.
• Security: Several Data Sources are connected in a very secure manner. Importing and exporting large amounts of data is simple.
• Usability: Tableau is simple to use and requires no technical or programming knowledge. Tableau is a Data Visualization program that can be downloaded to mobile devices and desktop computers to make Data Access and Analysis simple.

Tableau Architecture

• Data Layer: Tableau’s Data Layer allows it to connect to a range of different data sources. These data sources could be nearby or far away. Users can simply improve the speed and responsiveness of their data with Tableau’s fast in-memory data engine.
• Data Connectors: This is a collection of data connectors that have been optimized for use with databases. Any system that doesn’t have a native connector can use common Open Database Connection (ODBC) connectors. Tableau offers two types of data interaction: live connection and in-memory. Users can switch between live and in-memory connections whenever they choose.
• Components of Tableau Server:
  • Data Server: The Data Server makes Metadata Administration, Driver Deployment, and Extract Management easier to manage by centralizing them.
  • VizQL Server: The VizQL Server is used to convert data source queries into visuals.
  • Application Server: The Application Server is in charge of all login operations, permission management, authentications, and authorizations.

• Gateway: A gateway, often known as a Load Balancer, is a type of web server that allows clients to access Tableau Server components over HTTP.

What are the Date Functions Available in Tableau?

Function	Syntax	Description
DATEADD	DATEADD(date_part, interval, date)	The supplied date is returned with the specified number interval added to the specified date part.
DATEDIFF	DATEDIFF(date_part, date1, date2, [start_of_week])	The difference between dates 1 and 2 represented in date part units is returned.
DATENAME	DATENAME(date_part, date, [start_of_week])	As a string, returns the date part of the date. Optionally, you can use the start of week parameter to define which day should be regarded the starting of the week.
DATEPARSE	DATEPARSE(date_format, [date_string])	As a date, returns [date string]. The date format option specifies the format of the [string] field. Because the string field might be organised in a variety of ways, the date format must match perfectly. All connections are available.
DATEPART	DATEPART(date_part, date, [start_of_week])	As an integer, returns the date part of the date.
DATETRUNC	DATETRUNC(date_part, date, [start_of_week])	The supplied date is truncated to the accuracy defined by the date part. A fresh date is returned by this function.
DAY	DAY(date)	As an integer, returns the day of the supplied date.
ISDATE	ISDATE(string)	If a provided string is a valid date, this function returns true.
MAKEDATE	MAKEDATE(year, month, day)	Returns a date value based on the year, month, and date supplied.
MAKEDATETIME	MAKEDATETIME(date, time)	Returns a datetime containing both a date and a time. A date, datetime, or string type can be used to represent the date. The time must be in the format of a datetime.
MAKETIME	MAKETIME(hour, minute, second)	Returns a date value based on the hour, minute, and second supplied.
MAX	MAX(expression) or MAX(expr1, expr2)	It’s most commonly used with numbers, but it can also be used with dates. The maximum of a and b is returned (a and b must be of the same type). If either parameter is null, it returns Null.
MIN	MIN(expression) or MIN(expr1, expr2)	It’s most commonly used with numbers, but it can also be used with dates. The minimum of a and b is returned (a and b must be of the same type). If either parameter is null, the function returns Null.
MONTH	MONTH(date)	As an integer, returns the month of the provided date.
NOW	NOW( )	The current date and time on the local system are returned.
QUARTER	QUARTER ( )	As an integer, returns the quarter of the specified date.
TODAY	TODAY( )	The current date is returned.
WEEK	WEEK( )	As an integer, returns the week of the specified date.
YEAR	YEAR (date)	As an integer, returns the year of the specified date.
ISOQUARTER	ISOQUARTER (date)	As an integer, returns the ISO8601 week-based quarter of a given date.
ISOWEEK	ISOWEEK (date)	As an integer, this function returns the ISO8601 week-based week of a specified date.
ISOWEEKDAY	ISOWEEKDAY (date)	As an integer, this function returns the ISO8601 weekday of a specified date.
ISOYEAR	ISOYEAR (date)	As an integer, this function returns the ISO8601 week-based year of a specified date.

Understanding the Salient Aspects of DatePart Tableau Function 

The DATEPART Tableau Function is used to extract or return a portion of a date. To provide the date component, use the first arg.

YEAR, MONTH, DAY, and other dates are accepted by this DatePart Tableau function. If you choose Month as the date component, for example, the DatePart Tableau function will return a year from a particular date.

How to Refer to DatePart Tableau Function?

To manipulate date fields, you must first understand how to refer to the various date portions in DatePart Tableau. On their website, Tableau includes the table below, which demonstrates how to refer to date components in DatePart Tableau Function.

Category	Date Part	DatePart Tableau
Time	Second	‘second’
Time	Minute	‘minute’
Time	Hour	‘hour’
Date	Day	‘day’
Date	Day of the week	‘weekday’
Date	Day of the year	‘dayofyear’
Date	Week	‘week’
Date	Month	‘month’
Date	Quarter	‘quarter’
Date	Year	‘year’
ISO	Day of week	‘iso-weekday’
ISO	Week	‘iso-week’
ISO	Quarter	‘iso-quarter’
ISO	Year	‘iso-year’

Using DatePart Tableau

DatePart Tableau has the following syntax:

DATEPART(date_part,Date,[Start of week])

The start of the week is defined as the first day of the week. The values would be Sunday, “Monday,’ and so on. If this is left blank, DatePart Tableau uses the data source’s default start of the week – see the Tableau Date Properties section earlier.

An example, to return the quarter of OrderDate:

DATEPART('quarter',[OrderDate])

DatePart Tableau always returns an integer:

DatePart Tableau	Returns
‘second’	0-59
‘minute’	0-59
‘hour’	0-23
‘day’	1-31
‘weekday’	1-7
‘dayofyear’	1-366
‘week’	1-53
‘month’	1-12
‘quarter’	1-4
‘year’	e.g. 2020
‘iso-weekday’	1-7
‘iso-week’	1-53
‘iso-quarter’	1-4
‘iso-year’	e.g. 2020

DatePart Tableau: Why Use Date Functions?

You can use date functions to manipulate dates in your data source.

For example, you might have a date field containing values for year, month, and day (2004-04-15). A date function, such as the DATETRUNC function, can be used to construct new date values from these existing values. For example, any existing date value can be used to discover the date of the quarter’s start.

The date calculation will look something like this:

DATETRUNC('quarter', [Order Date])

If the original date is ‘3/27/2011,’ the above calculation will provide ‘1/1/2011,’ indicating that Q1 began on January 1. The calculation would return ‘4/1/2011’ if the original date was ‘5/3/2011,’ indicating that Q2 began on April 1, four months into the year.

Conclusion

Through this article, you learned about Tableau and Date functions. Further, you learned about why and how to use date functions and about DatePart Tableau function.

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