Excerpt 

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. 
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 10
, 9
, 9
, and 8
, then KTHLARGEST
returns 9
for k=2
and 8
for k=3
.
When used in a pivot
transform, the function is computed for each instance of the value specified in the group
parameter. See Pivot Transform.
Input column can be of Integer or Decimal type. Nonnumeric data in the column is ignored. If a row contains a missing or null value, it is not factored into the calculation.
D code 

pivot value:KTHLARGESTUNIQUE(myRating, 3) group:postal_code limit:1 
Output: Generates a twocolumn table containing the unique values in the postal_code
column and the third highest unique value from the myRating
column for that postal_code
value. The limit
parameter defines the maximum number of output columns.
D code 

pivot value:KTHLARGESTUNIQUE(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 unique value to extract from the source column 
For more information on the group
and limit
parameters, see Pivot Transform.
function_col_ref
Name of the column the values of which you want to calculate the mean. Column must contain Integer or Decimal values.
 Literal values are not supported as inputs.
 Multiple columns and wildcards are not supported.
Required?  Data Type  Example Value 

Yes  String (column reference)  myValues 
k_integer
Integer representing the ranking of the unique value to extract from the source column. Duplicate values are treated as a single value for purposes of this function's calculation.
Info 

NOTE: 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
.
Required?  Data Type  Example Value 

Yes  Integer (positive)  4 
Include Page 

 EXAMPLE  KTHLARGEST Function 

 EXAMPLE  KTHLARGEST Function 

