Optimizing Transact-SQL : Advanced Programming Techniques
David Rozenshtein, Anatoly Abramovich, Eugene Birger, Tom Bondur · 1997
From the Publisher: Encoded characteristic functions (ECF) is a new, innovative SQL programming methodology which allows programmers to encode conditional logic as scalar expressions within certain clauses. These extremely powerful techniques are presented by the authors of ECF in Optimizing Transact-SQL.