Tags / unpivot
Transforming a Table with Column Names as Values for Phone Numbers
Unpivoting Oracle Tables: A Step-by-Step Guide to Multiple Columns
Using the stack() Method to Simplify Matrix DataFrame Manipulation
Pivot Functionality: Unpacking and Implementing the Concept with SQL
Unpivoting Multiple Rows: A Comprehensive Guide to Transforming Rows into Columns in SQL Server
Pivot Table Aggregation - Converting Rows to Columns by Date