PivotStatement <- PivotKeyword TableRef PivotOn? PivotUsing? GroupByClause?

PivotOn <- 'ON' PivotColumnList
PivotUsing <- 'USING' TargetList

PivotColumnList <- List(Expression)

PivotKeyword <- 'PIVOT' / 'PIVOT_WIDER'
UnpivotKeyword <- 'UNPIVOT' / 'PIVOT_LONGER'

UnpivotStatement <- UnpivotKeyword TableRef 'ON' TargetList IntoNameValues?

IntoNameValues <- 'INTO' 'NAME' ColIdOrString ValueOrValues List(Identifier)

ValueOrValues <- 'VALUE' / 'VALUES'

IncludeExcludeNulls <- ('INCLUDE' / 'EXCLUDE') 'NULLS'
UnpivotHeader <- ColIdOrString / Parens(List(ColIdOrString))