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When to use pivot, unpivot, and reverse pivot statements?


Asked by Nathaniel Watts on Dec 09, 2021 FAQ



Understanding PIVOT, UNPIVOT, and Reverse PIVOT Statements. The PIVOT statement is used to convert table rows into columns, while the UNPIVOT operator converts columns back to rows. Reversing a PIVOT statement refers to the process of applying the UNPIVOT operator to the already PIVOTED dataset in order to retrieve the original dataset.
Similarly,
The PIVOT statement is used to convert table rows into columns, while the UNPIVOT operator converts columns back to rows. Reversing a PIVOT statement refers to the process of applying the UNPIVOT operator to the already PIVOTED dataset in order to retrieve the original dataset.
One may also ask, Reversing a PIVOT statement refers to the process of applying the UNPIVOT operator to the already PIVOTED dataset in order to retrieve the original dataset. In this article, we will study these three concepts on different examples.
Keeping this in consideration,
If the PIVOT operator aggregated the data, then you will not get the original data back using the UNPIVOT operator. If the PVOT operator has not aggregated the data, then you will get the original data back using the UNPIVOT operator.
In this manner,
UNPIVOT in SQL Server: The UNPIVOT operator performs exactly the opposite operation to PIVOT. That is, the UNPIVOT operator turns COLUMNS into ROWS. Let us understand this with an example. We are going to use the following ProductSales table to understand this concept.