If a group has at least two elements of order 2, then this group is not cyclic.
举一反三
- The engine has one or two group of fuel pumps， depending upon （）.
- 在SQL查询语句中以下正确的子句顺序是？ A: WHERE --- GROUP BY --- HAVING --- ORDER BY B: GROUP BY --- HAVING --- ORDER BY --- WHERE C: WHERE --- HAVING --- GROUP BY --- ORDER BY D: GROUP BY --- ORDER BY --- HAVING --- WHERE
- A．SELECT Cno, AVG(Score) FROM SCS GROUP BY Score ORDER BY 2, Cno Desc B．SELECT Cno, AVG(Score) FROM SCS GROUP BY Cno ORDER BY 2, Cno Desc C．SELECT Cno, AVG(Score) FROM SCS WHERE Cno, Desc GROUP BY Score D．SELECT Cno, AVG(Score) FROM SCS GROUP BY, AVG(Score) ORDER BY, Cno Desc
- 把查询语句的各个子句按执行的先后顺序排列，正确的是( ) A: FROM→WHERE→GROUP BY→SELECT→ORDER BY B: SELECT→FROM→WHERE→GROUP BY→ORDER BY C: WHERE→FROM→SELECT→GROUP BY→ORDER BY D: FROM→WHERE→SELECT→ORDER BY→GROUP BY
- 以下SQL子句的撰写顺序表达正确的是： A: SELECT、FROM、WHERE、GROUP BY、HAVING、ORDER BY B: SELECT、FROM、WHERE、HAVING、GROUP BY、ORDER BY C: SELECT、FROM、WHERE、ORDER BY、HAVING、GROUP BY D: SELECT、FROM、ORDER BY、WHERE、GROUP BY、HAVING