75. The following data exists in the PRODUCTS table:
PROD_ID PROD_LIST_PRICE
123456 152525.99
You issue the following query:
SQL> SELECT RPAD(( ROUND(prod_list_price)), 10,'*')
FROM products
WHERE prod_id = 123456;
What would be the outcome?
A. 152526 ****
B. **152525.99
C. 152525** **
D. an error message
Answer: A
答案解析:
参考:http://blog.csdn.net/rlhua/article/details/12848395
Round( ) 函数
传回一个数值,该数值是按照指定的小数位元数进行四舍五入运算的结果
语法
ROUND( number, decimal_places )
number : 需四舍五入处理的数值
decimal_places : 四舍五入 , 小数取几位 ( 预设为 0 )
RPAD:返回一个表达式,右边使用一个字符表达式填充到n 个字符的长度。
实验验证:
scott@TESTDB> create table products(prod_id number,prod_list_price number);
Table created.
scott@TESTDB> insert into products values(123456,152525.99);
1 row created.
scott@TESTDB> select * from products;
PROD_ID PROD_LIST_PRICE
---------- ---------------
123456 152525.99
scott@TESTDB> select round(PROD_LIST_PRICE) from products;
ROUND(PROD_LIST_PRICE)
----------------------
152526
scott@TESTDB> select rpad((round(PROD_LIST_PRICE)),10,'*') from products;
RPAD((ROUND(PROD_LIS
--------------------
152526****