Key Columns dialog

When you perform random sampling, you can set an option for the operator to always create the same set of random rows for each sample data generation, and then you can specify the primary and secondary keys. Select the columns that the operator should use.

Setting	Description
All/None	All selects every column displayed in the list. None clears every selected checkbox.
Filter data	Type the name of a column to filter on that value. As you type, the list of columns is filtered.