ISNULL() VS COALESCE() http://code.msdn.microsoft.com/SQLExamples/Wiki/View.aspx?title=ISNULL_COALESCE......
WHEN (EXPRESSION1 IS NOT NULL) THEN EXPRESSION1
……
ELSE Null
END
但是ISNULL的执行过程是如何工作的呢，难道是IF … else … ??
For Further Reading
ISNULL (MSDN)
COALESCE (MSDN)
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