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This article introduces logical functions and their uses in Tableau. It also demonstrates how to create a logical calculation using an example. 
Why use logical calculationsMusic Composition SoftwareLogical calculations allow you to determine if a certain condition is true or false (boolean logic). For example, you might want to quickly see if sales for each country you distribute your merchandise to were above or below a certain threshold.
The logical calculation might look something like this:
SUM(Sales) > 1,000,000 
Logical functions available in Tableau:FunctionSyntaxDescription
IN IN  Returns TRUE if any value in  matches any value in . 
The values in  can be a Set, list of literal values, or a combined field. 
Examples:
SUM([Cost]) IN (1000, 15, 200)
[SET] IN [COMBINED FIELD]
AND
IF  AND  THEN  ENDPerforms a logical conjunction on two expressions.
Example:
IF (ATTR([Market]) = 'Africa' AND SUM([Sales]) > [Emerging Threshold] )THEN 'Well Performing'
CASECASE  WHEN  THEN  WHEN  THEN  .. ELSE  ENDPerforms logical tests and returns appropriate values. The CASE function evaluates expression, compares it to a sequence of values, value1, value2, etc., and returns a result. When a value that matches expression is encountered, CASE returns the corresponding return value. If no match is found, the default return expression is used. If there is no default return and no values match, then Null is returned. 
CASE is often easier to use than IIF or IF THEN ELSE.
Typically, you use an IF function to perform a sequence of arbitrary tests, and you use a CASE function to search for a match to an expression. But a CASE function can always be rewritten as an IF function , although the CASE function will generally be more concise.
Many times you can use a group to get the same results as a complicated case function.
Examples:
CASE [Region] WHEN 'West' THEN 1 WHEN 'East' THEN 2 ELSE 3 END
CASE 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 END
ELSEIF  THEN  ELSE  ENDTests a series of expressions returning the  value for the first true .
Example:
If [Profit] > 0 THEN 'Profitable' ELSE 'Loss' END
ELSEIFIF  THEN  [ELSEIF  THEN ..] [ELSE ] ENDTests a series of expressions returning the  value for the first true .
Example:
IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Breakeven' ELSE 'Loss' END
ENDIF  THEN  [ELSEIF  THEN ..] [ELSE ] ENDTests a series of expressions returning the  value for the first true . Must be placed at the end of an expression. 
Example:
IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Breakeven' ELSE 'Loss' END
IFIF  THEN  [ELSEIF  THEN ..] [ELSE ] ENDTests a series of expressions returning the  value for the first true .
Example:
IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Breakeven' ELSE 'Loss' END
IFNULLIFNULL(expr1, expr2)Returns  if it is not null, otherwise returns .
Example:
IFNULL([Profit], 0)
IIFIIF(test, then, else, [unknown])Checks whether a condition is met, and returns one value if TRUE, another value if FALSE, and an optional third value or NULL if unknown.
Example:
IIF([Profit] > 0, 'Profit', 'Loss')
ISDATEISDATE(string)Returns true if a given string is a valid date.
Example:
ISDATE('2004-04-15') = True
ISNULLISNULL(expression)Returns true if the expression is NULL (does not contain valid data).
Example:
ISNULL([Profit])
MAXMAX(expression) or Max(expr1, expr2)Returns the maximum of a single expression across all records or the maximum of two expressions for each record.
Example:
MAX([Sales])
MINMIN(expression) or MIN(expr1, expr2)Returns the minimum of an expression across all records or the minimum of two expressions for each record.
Example:
MIN([Profit])
NOTIF NOT  THEN  ENDPerforms logical negation on an expression.
Example:
IF NOT [Profit] > 0 THEN 'Unprofitable' END
ORIF  OR  THEN  ENDPerforms a logical disjunction on two expressions.
Example:
IF [Profit] < 0 OR [Profit] = 0 THEN 'Needs Improvement' END
THENIF  THEN  [ELSEIF ,expr2> THEN ..] [ELSE ] ENDTests a series of expressions returning the  value for the first true .
Example:
IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Break even' ELSE 'unprofitable' END
WHENCASE  WHEN  THEN  .. [ELSE ] ENDFinds the first  that matches  and returns the corresponding .
Example:
CASE [RomanNumberal] WHEN 'I' THEN 1 WHEN 'II' THEN 2 ELSE 3 END
ZNZN(expression)Returns  if it is not null, otherwise returns zero.
Example:
ZN([Profit])

Create a logical calculation Free Composition SoftwareFollow along with the steps below to learn how to create a logical calculation.
In Tableau Desktop, connect to the Sample - Superstore saved data source, which comes with Tableau.
Navigate to a worksheet.
From the Data pane, drag State to the Rows shelf. 
From the Data pane, drag Category to the Rows shelf and place it to the right of State.
From the Data pane, drag Sales to the Columns shelf.
Select Analysis > Create Calculated Field.
In the calculation editor that opens, do the following:
Name the calculated field, KPI.
Enter the following formula:
SUM([Profit]) > 0
This calculation quickly checks if a member is great than zero. If so, it returns true; if not, it returns false.
Mac webcam software. When finished, click OK.
The new calculated field appears under Measures in the Data pane. Just like your other fields, you can use it in onr or more visualizations. 
From the Data pane, drag KPI to Color on the Marks card. 
You can now see which categories are losing money in each state. 
Composition Software FreeSee AlsoThanks for your feedback!

Function	Syntax	Description
IN	`IN`	Returns TRUE if any value in matches any value in . The values in can be a Set, list of literal values, or a combined field. Examples: `SUM([Cost]) IN (1000, 15, 200)` `[SET] IN [COMBINED FIELD]`
AND	`IF AND THEN END`	Performs a logical conjunction on two expressions. Example: `IF (ATTR([Market]) = 'Africa' AND SUM([Sales]) > [Emerging Threshold] )THEN 'Well Performing'`
CASE	`CASE WHEN THEN WHEN THEN .. ELSE END`	Performs logical tests and returns appropriate values. The CASE function evaluates `expression`, compares it to a sequence of values, `value1`, `value2`, etc., and returns a result. When a value that matches `expression` is encountered, CASE returns the corresponding return value. If no match is found, the default return expression is used. If there is no default return and no values match, then Null is returned. CASE is often easier to use than IIF or IF THEN ELSE. Typically, you use an IF function to perform a sequence of arbitrary tests, and you use a CASE function to search for a match to an expression. But a CASE function can always be rewritten as an IF function , although the CASE function will generally be more concise. Many times you can use a group to get the same results as a complicated case function. Examples: `CASE [Region] WHEN 'West' THEN 1 WHEN 'East' THEN 2 ELSE 3 END` `CASE 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 END`
ELSE	`IF THEN ELSE END`	Tests a series of expressions returning the value for the first true . Example: `If [Profit] > 0 THEN 'Profitable' ELSE 'Loss' END`
ELSEIF	`IF THEN [ELSEIF THEN ..] [ELSE ] END`	Tests a series of expressions returning the value for the first true . Example: `IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Breakeven' ELSE 'Loss' END`
END	`IF THEN [ELSEIF THEN ..] [ELSE ] END`	Tests a series of expressions returning the value for the first true . Must be placed at the end of an expression. Example: `IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Breakeven' ELSE 'Loss' END`
IF	`IF THEN [ELSEIF THEN ..] [ELSE ] END`	Tests a series of expressions returning the value for the first true . Example: `IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Breakeven' ELSE 'Loss' END`
IFNULL	`IFNULL(expr1, expr2)`	Returns if it is not null, otherwise returns . Example: `IFNULL([Profit], 0)`
IIF	`IIF(test, then, else, [unknown])`	Checks whether a condition is met, and returns one value if TRUE, another value if FALSE, and an optional third value or NULL if unknown. Example: `IIF([Profit] > 0, 'Profit', 'Loss')`
ISDATE	`ISDATE(string)`	Returns true if a given string is a valid date. Example: `ISDATE('2004-04-15') = True`
ISNULL	`ISNULL(expression)`	Returns true if the expression is NULL (does not contain valid data). Example: `ISNULL([Profit])`
MAX	`MAX(expression)` or `Max(expr1, expr2)`	Returns the maximum of a single expression across all records or the maximum of two expressions for each record. Example: `MAX([Sales])`
MIN	`MIN(expression)` or `MIN(expr1, expr2)`	Returns the minimum of an expression across all records or the minimum of two expressions for each record. Example: `MIN([Profit])`
NOT	`IF NOT THEN END`	Performs logical negation on an expression. Example: `IF NOT [Profit] > 0 THEN 'Unprofitable' END`
OR	`IF OR THEN END`	Performs a logical disjunction on two expressions. Example: `IF [Profit] < 0 OR [Profit] = 0 THEN 'Needs Improvement' END`
THEN	`IF THEN [ELSEIF ,expr2> THEN ..] [ELSE ] END`	Tests a series of expressions returning the value for the first true . Example: `IF [Profit] > 0 THEN 'Profitable' ELSEIF [Profit] = 0 THEN 'Break even' ELSE 'unprofitable' END`
WHEN	`CASE WHEN THEN .. [ELSE ] END`	Finds the first that matches and returns the corresponding . Example: `CASE [RomanNumberal] WHEN 'I' THEN 1 WHEN 'II' THEN 2 ELSE 3 END`
ZN	`ZN(expression)`	Returns if it is not null, otherwise returns zero. Example: `ZN([Profit])`