大數據就業實戰培訓 Oracle就業實戰培訓
071考試題庫之前是比較穩定的，但隨著Oracle的調整，071考試不斷的增加新的考題，增加了考試的難度，所以我們專門收集整理了這些考試，并對這些考題進行解析，希望可以對考生有幫助。
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071考試-第45題、choose the best answer:
View the Exhibit and examine the data in the EMPLOYEES table.
You want to generate a report showing the total compensation paid to each employee to date(迄今為止支付給每位員工的總補償).
You issue the following query:
SQL>SELECT ename ||' joined on '|| hiredate ||
', the total compensation paid is '||
TO_CHAR(ROUND(ROUND(SYSDATE-hiredate)/365) * sal + comm)
"COMPENSATION UNTIL DATE"
FROM employees;
What is the outcome?
A) It executes successfully and gives the correct output.
B) It generates an error because the usage of the ROUND function in the expression is not valid.
C) It generates an error because the concatenation operator can be used to combine only two items.
D) It generates an error because the alias is not valid.
E) It executes successfully but does not give the correct output.
Answer：E
(解析：因為 comm 列上有空值，所以會導致某些計算的結果為空)
