MAX Function

Computes the maximum value found in all row values in a column. Inputs can be Integer, Decimal, or Datetime.

When used in apivottransform, the function is computed for each instance of the value specified in thegroupparameter. See Pivot Transform.
If a row contains a missing or null value, it is not factored into the calculation.
If no numeric values are found in the source column, the function returns a null value.

For a version of this function computed over a rolling window of rows, see ROLLINGMAX Function.

Datetime inputs to this function return Unixtime values.

These values can be wrapped in a DATEFORMAT function. See DATEFORMAT Function.
For a date-native version of this function, see MAXDATE Function.

Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.

Basic Usage

max(myRating)

Output: Returns the maximum value of the myRating column.

Syntax and Arguments

max(function_col_ref) [group:group_col_ref] [limit:limit_count]

Argument	Required?	Data Type	Description
function_col_ref	Y	string	Name of column to which to apply the function

For more information on the group and limit parameters, see Pivot Transform.

For more information on syntax standards, see Language Documentation Syntax Notes.

function_col_ref

Name of the column the values of which you want to calculate the maximum. Inputs must be Integer, Decimal, or Datetime values.

Nota

If the input is in Datetime type, the output is in unixtime format. You can wrap these outputs in the DATEFORMAT function to generate the results in the appropriate Datetime format. See DATEFORMAT Function.

Literal values are not supported as inputs.
Multiple columns and wildcards are not supported.

Usage Notes:

Required?	Data Type	Example Value
Yes	String (column reference)	myValues

Examples

Suggerimento

For additional examples, see Common Tasks.

This example illustrates how you can apply statistical functions to your dataset. Calculations include average (mean), max, min, standard deviation, and variance.

Functions:

Item	Description
AVERAGE Function	Computes the average (mean) from all row values in a column or group. Input column can be of Integer or Decimal.
MIN Function	Computes the minimum value found in all row values in a column. Input column can be of Integer, Decimal or Datetime.
MAX Function	Computes the maximum value found in all row values in a column. Inputs can be Integer, Decimal, or Datetime.
VAR Function	Computes the variance among all values in a column. Input column can be of Integer or Decimal. If no numeric values are detected in the input column, the function returns `0`.
STDEV Function	Computes the standard deviation across all column values of Integer or Decimal type.
NUMFORMAT Function	Formats a numeric set of values according to the specified number formatting. Source values can be a literal numeric value, a function returning a numeric value, or reference to a column containing an Integer or Decimal values.
MODE Function	Computes the mode (most frequent value) from all row values in a column, according to their grouping. Input column can be of Integer, Decimal, or Datetime type.

Source:

Students took a test and recorded the following scores. You want to perform some statistical analysis on them:

Student	Score
Anna	84
Ben	71
Caleb	76
Danielle	87
Evan	85
Faith	92
Gabe	85
Hannah	99
Ian	73
Jane	68

Transformation:

You can use the following transformations to calculate the average (mean), minimum, and maximum scores:

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	AVERAGE(Score)
Parameter: New column name	'avgScore'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	MIN(Score)
Parameter: New column name	'minScore'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	MAX(Score)
Parameter: New column name	'maxScore'

To apply statistical functions to your data, you can use the VAR and STDEV functions, which can be used as the basis for other statistical calculations.

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	VAR(Score)
Parameter: New column name	var_Score

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	STDEV(Score)
Parameter: New column name	stdev_Score

For each score, you can now calculate the variation of each one from the average, using the following:

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	((Score - avg_Score) / stdev_Score)
Parameter: New column name	'stDevs'

Now, you want to apply grades based on a formula:

Grade	standard deviations from avg (stDevs)
A	stDevs > 1
B	stDevs > 0.5
C	-1 <= stDevs <= 0.5
D	stDevs < -1
F	stDevs < -2

You can build the following transformation using the IF function to calculate grades.

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	IF((stDevs > 1),'A',IF((stDevs < -2),'F',IF((stDevs < -1),'D',IF((stDevs > 0.5),'B','C'))))

To clean up the content, you might want to apply some formatting to the score columns. The following reformats the stdev_Score and stDevs columns to display two decimal places:

Transformation Name	`Edit column with formula`
Parameter: Columns	stdev_Score
Parameter: Formula	NUMFORMAT(stdev_Score, '##.00')

Transformation Name	`Edit column with formula`
Parameter: Columns	stDevs
Parameter: Formula	NUMFORMAT(stDevs, '##.00')

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	MODE(Score)
Parameter: New column name	'modeScore'

Results:

Student	Score	modeScore	avgScore	minScore	maxScore	var_Score	stdev_Score	stDevs	Grade
Anna	84	85	82	68	99	87.00000000000001	9.33	0.21	C
Ben	71	85	82	68	99	87.00000000000001	9.33	-1.18	D
Caleb	76	85	82	68	99	87.00000000000001	9.33	-0.64	C
Danielle	87	85	82	68	99	87.00000000000001	9.33	0.54	B
Evan	85	85	82	68	99	87.00000000000001	9.33	0.32	C
Faith	92	85	82	68	99	87.00000000000001	9.33	1.07	A
Gabe	85	85	82	68	99	87.00000000000001	9.33	0.32	C
Hannah	99	85	82	68	99	87.00000000000001	9.33	1.82	A
Ian	73	85	82	68	99	87.00000000000001	9.33	-0.96	C
Jane	68	85	82	68	99	87.00000000000001	9.33	-1.50	D

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