In terms of the "classic" programming titles, the ones that tend to get name-checked are the likes of:
"C Programming Language" by Kernighan & Ritchie
"The Art of Computer Programming" by Donald Knuth
"The Pragmatic Programmer" by Hunt and Thomas
"Code Complete" by Steve McConnell
"Design Patterns: Elements of Reusable Object-Oriented Software" by Gamma, Helm, Johnson, Vlissides
"The Mythical Man Month" by Brooks
They are, in the main, not tied in to a particular language or software release. People tend to refer to K&R years after they stopped programming in C. Part of what I was wondering with this editorial was: what are the equivalent "classics" for the DBA?
The discussion has mentioned many excellent books that are specifically concerned with certain aspects of programming SQL Server, but few of what I would term "classic" database titles such as Joe Celko's "SQL for Smarties", or C.J. Date's "Introduction to Database Systems".