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A pivot (or crosstab) converts row data into columnar data, and vice versa for an unpivot. Not all databases support explicit PIVOT syntax but the functionality can be implemented, often using decision logic (CASE statements, etc), aggregate functions, or an extension.

Databases that support PIVOT/UNPIVOT syntax:

  • Oracle 11g+
  • SQL Server 2005+

PostgreSQL includes crosstab() in the tablefunc optional module.

While MySQL does not have a PIVOT function, this can be emulated with plain SQL using aggregate functions and CASE statements, which works in all other RDBMS as well.