Database Sampling (legacy)

This node is part of the legacy database framework. For more information on how to migrate to the new database framework see the migration section of the database documentation.

This node extracts a sample (a bunch of rows) from the input data of a database. The dialog enables you to specify the sample size. The following options are available in the dialog:

Options

Absolute: Specify the absolute number of rows in the sample. If there are less rows than specified here, all rows are used.
Relative: The percentage of the number of rows in the sample. Must be between 0 and 100, inclusively.
Take from top: This mode selects the top most rows of the table. Note that this depends on the implementation of the connected database.
Draw randomly: Random sampling of all rows if connected database will support random sampling. Note that this method might be very slow for large database tables.
Stratified sampling: Check this button if you want stratified sampling, i.e. the distribution of values in the selected column is (approximately) retained in the output table.

Input Ports

: Table in database to apply database sampling

Output Ports

: Table in the database with sampled rows

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