Aggregate Function on Uniqueidentifier (GUID)

Question

Let\'s say I have the following table:

category | guid
---------+-----------------------
   A     | 5BC2...
   A     | 6A1C...
   B     | 92A2...

Answer 1

Aggregate functions can be used on Uniqueidentifier columns if SQL Server Version >= 2012

expression

Is a constant, column name, or function, and any combination of arithmetic, bitwise, and string operators. MIN can be used with numeric, char, varchar, uniqueidentifier, or datetime columns, but not with bit columns. Aggregate functions and subqueries are not permitted.