OCP-1Z0-051-V9.02-67题

67. Which two statements are true regarding the ORDER BY clause? (Choose two.)
A. It is executed first in the query execution.
B. It must be the last clause in the SELECT statement. 
C. It cannot be used in a SELECT statement containin g a HAVING clause.
D. You cannot specify a column name followed by an expression in this clause. order by可以用表达式
E. You can specify a combination of numeric positions and column names in this clause. 您可以指定数字的位置和在本节中列名的组合
Answer: BE
答案解析:
A错,使用ORDER BY 子句,该子句必须是SQL 语句的最后一个子句。
B对,
C错,放在最后就可以了。
D错,可以指定表达式、别名或列位置或组合作为排序条件
E对,可以指定表达式、别名或列位置或组合作为排序条件