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KTHLARGESTUNIQUEDATEIF Function

Extracts the ranked unique Datetime value from the values in a column, where k=1 returns the maximum value, when a specified condition is met. The value for k must be between 1 and 1000, inclusive. Inputs must be Datetime.

KTHLARGESTUNIQUEDATEIF calculations are filtered by a conditional applied to the group.

For purposes of this calculation, two instances of the same value are treated as the same value of k. So, if your dataset contains four rows with column values 2020-02-15, 2020-02-14, 2020-02-14, and 2020-02-13, then KTHLARGESTUNIQUEDATEIF returns 2020-02-14 for k=2 and 2020-02-13 for k=3.

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

Nota

When added to a transformation, this function is applied to the current sample. If you change your sample or run the job, the computed values for this function are updated. Transformations that change the number of rows in subsequent recipe steps do not affect the values computed for this step.

To perform a simple kth largest unique calculation on Datetime values without conditionals, use the KTHLARGESTUNIQUEDATE function. See KTHLARGESTUNIQUEDATE Function.

For a version of this function that applies to non-Datetime values, see KTHLARGESTUNIQUE 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

kthlargestuniquedateif(transDate, 2, salesPerson == 'jsmith')

Output: Returns the secondmost recent unique Date (rank=2) from the transDate column when the salesPerson value is jsmith.

Syntax and Arguments

kthlargestuniquedateif(col_ref, limit, test_expression) [group:group_col_ref] [limit:limit_count]

Argument

Required?

Data Type

Description

col_ref

Y

string

Reference to the column you wish to evaluate.

k_integer

Y

integer

The ranking of the value to extract from the source column

test_expression

Y

string

Expression that is evaluated. Must resolve to true or false

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

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

col_ref

Name of the column whose values you wish to use in the calculation. Inputs must be Datetime values.

Usage Notes:

Required?

Data Type

Example Value

Yes

String that corresponds to the name of the column

transactionDate

k_integer

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

Nota

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.

test_expression

This parameter contains the expression to evaluate. This expression must resolve to a Boolean (true or false) value.

Usage Notes:

Required?

Data Type

Example Value

Yes

String expression that evaluates to true or false

(LastName == 'Mouse' && FirstName == 'Mickey')

Examples

Sugerencia

For additional examples, see Common Tasks.

Example - KTHLARGESTDATE functions

This example illustrates how you can apply conditionals to calculate minimum, maximum, and most common date values.

Functions:

Item

Description

KTHLARGESTDATE Function

Extracts the ranked Datetime 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 must be valid Datetime values.

KTHLARGESTUNIQUEDATE Function

Extracts the ranked unique Datetime 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 must be Datetime.

KTHLARGESTDATEIF Function

Extracts the ranked Datetime value from the values in a column, where k=1 returns the maximum value, when a specified condition is met. The value for k must be between 1 and 1000, inclusive. Inputs must be Datetime.

KTHLARGESTUNIQUEDATEIF Function

Extracts the ranked unique Datetime value from the values in a column, where k=1 returns the maximum value, when a specified condition is met. The value for k must be between 1 and 1000, inclusive. Inputs must be Datetime.

Source:

Here is some example transaction data:

Date

Product

Units

UnitCost

OrderValue

3/28/2020

ProductA

4

10.00

40.00

3/8/2020

ProductB

4

20.00

80.00

3/12/2020

ProductC

2

30.00

60.00

3/23/2020

ProductA

1

10.00

10.00

3/20/2020

ProductB

2

20.00

40.00

3/12/2020

ProductC

9

30.00

270.00

3/28/2020

ProductA

5

10.00

50.00

3/23/2020

ProductB

8

20.00

160.00

3/16/2020

ProductC

9

30.00

270.00

3/8/2020

ProductA

5

10.00

50.00

3/10/2020

ProductB

3

20.00

60.00

3/13/2020

ProductC

1

30.00

30.00

3/12/2020

ProductA

7

10.00

70.00

3/10/2020

ProductB

7

20.00

140.00

3/24/2020

ProductC

9

30.00

270.00

3/15/2020

ProductA

8

10.00

80.00

3/10/2020

ProductB

5

20.00

100.00

3/10/2020

ProductC

4

30.00

120.00

Transformation:

The following transformation computes the third highest date in the Date column:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

kthlargestdate(Date, 3)

Parameter: New column name

'kthlargestdate'

This transformation computes the third highest unique value in the Date column:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

kthlargestuniquedate(Date, 3)

Parameter: New column name

'kthlargestuniquedate'

Following transformation calculates the 3rd highest date value when the OrderValue > 200:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

kthlargestdateif(Date, 3, OrderValue > 200)

Parameter: New column name

'kthlargestdateif'

Following transformation calculates the 3rd highest unique date value when the OrderValue > 200:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

kthlargestuniquedateif(Date, 3, OrderValue > 200)

Parameter: New column name

'kthlargestuniquedateif'

Results:

Date

Product

Units

UnitCost

OrderValue

kthlargestdate

kthlargestuniquedate

kthlargestdateif

kthlargestuniquedateif

3/28/2020

ProductA

4

10.00

40.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/8/2020

ProductB

4

20.00

80.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/12/2020

ProductC

2

30.00

60.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/23/2020

ProductA

1

10.00

10.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/20/2020

ProductB

2

20.00

40.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/12/2020

ProductC

9

30.00

270.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/28/2020

ProductA

5

10.00

50.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/23/2020

ProductB

8

20.00

160.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/16/2020

ProductC

9

30.00

270.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/8/2020

ProductA

5

10.00

50.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/10/2020

ProductB

3

20.00

60.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/13/2020

ProductC

1

30.00

30.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/12/2020

ProductA

7

10.00

70.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/10/2020

ProductB

7

20.00

140.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/24/2020

ProductC

9

30.00

270.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/15/2020

ProductA

8

10.00

80.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/10/2020

ProductB

5

20.00

100.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020

3/10/2020

ProductC

4

30.00

120.00

03-24-2020

03-23-2020

03-23-2020

03-23-2020