OCP-1Z0-051-V9.02-75题
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.iyunv.com/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 * fromproducts; PROD_ID PROD_LIST_PRICE---------- --------------- 123456 152525.99 scott@TESTDB> select round(PROD_LIST_PRICE) from products; ROUND(PROD_LIST_PRICE)---------------------- 152526scott@TESTDB> select rpad((round(PROD_LIST_PRICE)),10,'*') from products; RPAD((ROUND(PROD_LIS--------------------152526****
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