|  | ## Append

#### Synopsis

Build a merged example set from two or more compatible example sets by adding all examples into a combined set.

#### Description

This operator merges two or more given example sets by adding all examples in one example table containing all data rows. Please note that the new example table is built in memory and this operator might therefore not be applicable for merging huge data set tables from a database. In that case other preprocessing tools should be used which aggregates, joins, and merges tables into one table which is then used by RapidMiner.

All input example sets must provide the same attribute signature. That means that all examples sets must have the same number of (special) attributes and attribute names. If this is true this operator simply merges all example sets by adding all examples of all table into a new set which is then returned.

#### Input

- example set 1: expects: ExampleSet (collection)

#### Output

- merged set:

#### Parameters

- datamanagement: Determines, how the data is represented internally.
- merge type: Indicates if all input example sets or only the first two example sets should be merged.

#### ExampleProcess