unpivot

English

Etymology

From un- +‎ pivot.

Verb

unpivot (third-person singular simple present unpivots, present participle unpivoting, simple past and past participle unpivoted)

1. (transitive, computing, databases) To convert columns into rows, so as to undo a pivot operation.
   • 2005, Rick Dobson, Beginning SQL Server 2005 Express Database Applications, page 243:

     Unpivoting a cross tab reconstructs a table in a relational format from a cross-tab data source.