Abstract: The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so ...

Robert A. Berenson ([email protected]), Urban Institute, Washington, D.C. Kevin J. Hayes, Upper Marlboro, Maryland. Value-based payment has been promoted for increasing quality, controlling spending, ...

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Discover more about the many different types of birds found around the world with Cam and Sophie the barn owl from One Zoo Three. What are reptiles? Discover the cold-blooded world of reptiles with ...