CASE statements considered as the heart of many languages. where they control execution of other commands. These are found in SQL, and used for query optimization and query filtering. Just like in SQL, it also happens in Tableau. In today’s blog tableau case statements, we will discuss in depth about the Statements.
We know that tableau is a BI tool, that allow us to take decisions at every aspect. It is updated and advanced BI tool know as self service tool, and referred by many IT members. Tableau is designed to perform and provide fast analytics.
Tableau Case Statements
Description
It performs logical operations and comes back with exact values. This function solves expression, it compares it to serial values. That is just like value1, value2, many more. And returns with result. If a value matches the communication, it was encountered, and comes back with corresponding return value. If there is no default mode and no value matches, then Null is returned to it.
Every time, it is very easier than IF THEN ELSE or IIF.
Generally, we can use IF function for performing a serial of arbitrary exams. If you utilize part to search for match or just an communication. But the explanation every time rewritten as IF function. Moreover, the explanation will be more concise. Every time you can implement a use of group, for getting the exact results as a critical part.
Instances
Function = CASESyntax = CASECASE [Region] WHEN 'West' THEN 1 WHEN 'East' THEN 2 ELSE 3 ENDCASE LEFT (DATENAME('weekday',[Order Date]),3) WHEN 'Sun' THEN 0 WHEN 'Mon' THEN 1 WHEN 'Tue' THEN 2 WHEN 'Wed' THEN 3 WHEN 'Thu' THEN 4 WHEN 'Fri' THEN 5 WHEN 'Sat' THEN 6 ENDFunction = WHEN
Syntax = WHEN
Syntax
CASEWHEN THEN ... [ELSE ] END
Instance
CASE [RomanNumberal] WHEN 'I' THEN 1 WHEN 'II' THEN 2 ELSE 3 ENDCASE expression - value 1 THEN return1- value2 THEN return2…ELSE default come back finish.
This explanation is equipped to operate logical checking and come back values that guide the report. It also operates every time rewritten as an IF function. Every time logical functions were less complicated.
CASE [place] WHEN “new York city”THEN “NYC” WHEN “ New Jersey” THEN “NJ” Else “WORLD” END
Statement designs a replacement filed by going with country field. Once “New York City” found from that. It use “NYC”, once “new jersey” found it use “nj”. All values will receive “world”.
This function is very similar to IF() explanation. It is very fast for a user to think and understand about it. Not to mention, it is an Important difference from IF() part. You can solve Boolean communication with the help of explanation examinations.
Example
CASE [Profit]WHEN>0 then ‘profitable’ELSE ‘loss’END
We have genuine information about tableau case statements, that CASE() is faster than if () in old versions. However, in latest tableau releases, we cannot see it, the main differentiation is readable, null values, Boolean tests and many more.
First option use CASE(), there is no need to perform Boolean communication in your test logic and test argument.
Second option – use IF() for critical logical or don’t need to manage NULLS. It is more comfortable and it includes the IS NULL logic in your total calculation.
The Third option – use IIF() for simple and easy logical calculations and they require to manage NULL values.
Advantages
This statements were very simple and easier to write.
Due to the simplicity, a client or a user avoids making mistakes.
It is faster than if else statements.
Initiating Expressions
This expression used to operate if then else logic in SQL.
It is equal to Decode, but it is ANSI compliant.
It used for executing the conditions on a big range depended up on comparison.
This communications divided into two types.
Like Simple CASE and Search expressions.
Now we go with simple one's.
These communications used to know the returned value.
They work with Equality comparison and they are similar to decode.
It contains a selector that associate the compared value from the constant.
The Value in the selector s utilized for comparing the communications that used on clause.
Search expressions
This explanation utilizes conditions for determining the returned value. It guides in scripting multiple conditions for salvation. It uses in range analysis of values.