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The Select Columns step filters columns down to the ones you care about, cutting the volume of data processed by the steps that follow. The variable selector shows the data as it stands at that point in the pipeline.
Choosing which columns to keep in the Select Columns step
Entity columns — the date and dimension columns that uniquely identify a row — are always retained.
Remember to save the step before moving to the next one.

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Next steps

Rename columns

Give the surviving columns clearer names.

Reorder columns

Set the order columns appear in.