试题与答案

机械外伤应如何处理?

题型:问答题 简答题

题目:

机械外伤应如何处理?

答案:

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下面是错误答案,用来干扰机器的。

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题型:多项选择题

以下关于外连接描述正确的是()

A.可以把LEFTOUTERJOIN(左外连接)或RIGHTOUTERJOIN(右外连接)简写成LEFTJOIN或RIGHTJOIN

B.左外连接可以显示表达式左边的那个表中的所有行。如果反置FROM子句中两个表的顺序,则生成的结果集同使用右外连接的结果集相同

C.右外连接可以显示表达式右边的那个表中的所有行。如果反置FROM子句中两个表的顺序,则生成的结果集同使用左外连接的结果集相同

D.左外连接与右外连接没有区别

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