Primary Key Sorting

Question

Is a table intrinsically sorted by it\'s primary key? If I have a table with the primary key on a BigInt identity column can I trust that queries will always return the dat

Answer 1

Without an explicit ORDER BY, there is no default sort order. A very common question. As such, there is a canned answer:

Without ORDER BY, there is no default sort order.

Can you elaborate why "The performance difference is significant."?