SQL
A logical flaw with function-based CHECK constraints in SQL Server
Limitation of using functions to evaluate multi-row CHECK constraints
Not the model, Bill Reaction to an InfoWorld report about Bill Gates' views on declarative code and modelling
The nullable uniqueness constraints dilemma (feedback on Microsoft Connect):
Change UNIQUE constraint to allow multiple NULL values
Don't allow nullable columns as part of UNIQUE constraints
SQL Server data types
Microsoft Integration Services vs Informatica PowerCenter feature comparison
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