See the Exhibit and examine the structure and data in the INVOICE table:@H_301_3@ Exhibit:@H_301_3@ @H_301_3@ Which two sql statements would executes successfully? (Choose two.)@H_301_3@ A. SELECT MAX(inv_date),MIN(cust_id) FROM invoice;@H_301_3@ B. SELECT MAX(AVG(SYSDATE - inv_date)) FROM invoice;@H_301_3@ C. SELECT AVG(inv_date) FROM invoice;@H_301_3@ D. SELECT AVG(inv_date - SYSDATE),AVG(inv_amt) FROM invoice;@H_301_3@ @H_301_3@ 答案: A,D@H_301_3@
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二、题目翻译@H_301_3@
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三、题目解析@H_301_3@
B选项不正确，SYSDATE - inv_date的结果是数字，这里AVG的结果就只有一条记录了，再求MAX，就没意义了，这句会报错。 C选面不正确，inv_date是日期类型，AVG求日期的平均值，会报错。
