/* Another strategy to add a surrogate key to an existing table is to concatenate existing columns with the CONCAT() function. The table is populated with 10 rows of completely fictional data.

Use the xref:System.Linq.Queryable.Concat%2A operator to concatenate two sequences. The xref:System.Linq.Queryable.Concat%2A operator is defined for ordered multisets where the orders of the receiver ...