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KTHLARGEST Function

Extracts the ranked value from the values in a column, where k=1 returns the maximum value. The value for k must be between 1 and 1000, inclusive. Inputs can be Integer, Decimal, or Datetime.

For purposes of this calculation, two instances of the same value are treated as separate values. So, if your dataset contains three rows with column values10,9, and9, thenKTHLARGESTreturns9fork=2andk=3.

When used in apivottransform, the function is computed for each instance of the value specified in thegroupparameter. See Pivot Transform.

Input column can be of Integer, Decimal, or Datetime type. Other values column are ignored. If a row contains a missing or null value, it is not factored into the calculation.

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

kthlargest(myRating, 2)

Output: Returns the second highest value from the myRating column.

Syntax and Arguments

kthlargest(function_col_ref, k_integer) [ 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

k_integer

Y

integer (positive)

The ranking of the value to extract from the source column

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 mean. Inputs must be Integer, Decimal, or Datetime values.

注意

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

k_integer

Integer representing the ranking of the value to extract from the source column.

注意

The value for k must be an integer between 1 and 1,000 inclusive.

  • k=1 represents the maximum value in the column.

  • If k is greater than or equal to the number of values in the column, the minimum value is returned.

  • Missing and null values are not factored into the ranking of k.

Usage Notes:

Required?

Data Type

Example Value

Yes

Integer (positive)

4

Examples

提示

For additional examples, see Common Tasks.

This example explores how you can use aggregation functions to calculate rank of values in a column.

Functions:

Item

Description

KTHLARGEST Function

Extracts the ranked value from the values in a column, where k=1 returns the maximum value. The value for k must be between 1 and 1000, inclusive. Inputs can be Integer, Decimal, or Datetime.

KTHLARGESTUNIQUE Function

Extracts the ranked unique value from the values in a column, where k=1 returns the maximum value. The value for k must be between 1 and 1000, inclusive. Inputs can be Integer, Decimal, or Datetime.

Source:

You have a set of student test scores:

Student

Score

Anna

84

Ben

71

Caleb

76

Danielle

87

Evan

85

Faith

92

Gabe

87

Hannah

99

Ian

73

Jane

68

Transformation:

You can use the following transformations to extract the 1st through 4th-ranked scores on the test:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

KTHLARGEST(Score, 1)

Parameter: New column name

'1st'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

KTHLARGEST(Score, 2)

Parameter: New column name

'2nd'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

KTHLARGEST(Score, 3)

Parameter: New column name

'3rd'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

KTHLARGEST(Score, 4)

Parameter: New column name

'4th'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

KTHLARGESTUNIQUE(Score, 3)

Parameter: New column name

'3rdUnique'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

KTHLARGESTUNIQUE(Score, 4)

Parameter: New column name

'4thUnique'

Results:

When you reorganize the columns, the dataset might look like the following:

Student

Score

1st

2nd

3rd

4th

3rdUnique

4thUnique

Anna

84

99

92

87

87

87

85

Ben

71

99

92

87

87

87

85

Caleb

76

99

92

87

87

87

85

Danielle

87

99

92

87

87

87

85

Evan

85

99

92

87

87

87

85

Faith

92

99

92

87

87

87

85

Gabe

87

99

92

87

87

87

85

Hannah

99

99

92

87

87

87

85

Ian

73

99

92

87

87

87

85

Jane

68

99

92

87

87

87

85

Notes:

  • The value87is both the third and fourth scores.

    • For the KTHLARGEST function, it is the output for the third and fourth ranking.

    • For the KTHLARGESTUNIQUE function, it is the output for the third ranking only.