SQL Server PIVOT functionality

Question

如果我们PIVOT任何表和UNPIVOT该表，我们得到我们的原始表？

Answer 1

No, will not always get the same table as the original table. It depends on the kind of data that we are looking at.

Check the SQL Fiddles for @Mahmoud Gamal 's data.

SQL Fiddle With SUM

SQL Fiddle With MAX

Answer 2

No you can get different result. because use aggregate function in pivote. and when you unpivote pivoted query maybe get different result, that such as aggregated orginal table on pivote fields.