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Can we eliminate most of the problems with Primary Keys by always

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Can we eliminate most of the problems with Primary Keys by always using non-intelligent, random, system generated

keys?  Is there a trend in the relational database design world to go this way?

 
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Which back-end data sources are supported by JDBC, ADO.NET,

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Which back-end data sources are supported by JDBC, ADO.NET, and PHP? Which are not covered? How is the gap handled

by each technology so that web applications can access the data they need?

 
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What are some of the performance issues with using joins?

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What are some of the performance issues with using joins? Are the performance

issues similar with subqueries? Explain.

 
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