【ocp-12c】最新Oracle OCP-071考試題庫(44題)
View the Exhibit and examine the details of the ORDER_ITEMS table.
Evaluate the following SQL statements:
Statement 1:
SELECT MAX(unit_price*quantity) "Maximum Order"
FROM order_items;
Statement 2:
SELECT MAX(unit_price*quantity) "Maximum Order"
FROM order_items
GROUP BY order_id;
Which statements are true regarding the output of these SQL statements? (Choose all that apply.)
A) Both statements would ignore NULL values for the UNIT_PRICE and QUANTITY columns.
B) Statement 1 would return only one row of output.
C) Both the statements would give the same output.
D) Statement 2 would return multiple rows of output.
E) Statement 1 would not return any row because the GROUP BY clause is missing.
Anser:ABD
(解析:對於 null 值,Oracle 計算的時候結果為空,但是在求最大值的時候,會忽略)
SQL> select sal*comm from emp;
SAL*COMM
480000
625000
1750000
…
SQL> select max(sal*comm) from emp;
MAX(SAL*COMM)
1750000
【ocp-12c】最新Oracle OCP-071考試題庫(44題)