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Which two statements are true regarding the ORDER BY clause? （）
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 containing a HAVING clause
D:You cannot specify a column name followed by an expression in this clause 
E:You can specify a combination of numeric positions and column names in this clause

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出自：Oracle认证

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