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A formula can only reference columns from it's own worksheet and one other worksheet in the workbook. Referencing columns from different worksheets is possible after a join sheet has first been created. 

Syntax for referencing a worksheet and column

SyntaxExample
Worksheet##apache_log
Column!!remoteUser
Worksheet and column#apache_log!remoteUser

Writing a function in the formula editor

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Enter a function name into the formula editor (case insensitive) with variables separated by a semicolon within parentheses.

Example:

Result explained
GE(#apache_log!status;400)

The Greater Than or Equal To function is being used comparing the "status" column from the "apache_log" worksheet
to see if the values are greater than or equal to the constant integer "400".

Writing nested functions in the formula editor

From the formula editor, you can enter functions and operators within functions.

ExampleResults explained
IF(EQUALS(#apache_log!status;400);"Bad Request";"other")The IF function is being used with the Equals function as one of the variables.

Anchor
formula_builder
formula_builder
Creating formulas using the formula builder

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