headBy

headBy returns the first n rows for each group.

Syntax

Parameters

ParameterTypeDescription
nRowslong

The number of rows to return for each group.

groupByColumnNamesString...

The column(s) by which to group data.

  • "X" will output the entire first n row(s) of each group in column X.
  • "X", "Y" will output the entire first n row(s) of each group designated from the X and Y columns.
groupByColumnNamesCollection<String>

The column(s) by which to group data.

  • "X" will output the entire first n row(s) of each group in column X.
  • "X", "Y" will output the entire first n row(s) of each group designated from the X and Y columns.

Returns

A new table containing the first n rows for each group.

Examples

In this example, headBy returns the first 2 rows, as grouped by X.

In this example, headBy returns the first 2 rows, as grouped by X and Y.