Choose two
The INVOICE table has a QTY_SOLD column of data type NUMBER and an INVOTCE_DATE column of data type DATE
NLS_DATE_FORMAT is set to DD-MON-RR.
Which two are true about data type conversions involving these columns in query expressions?
A) invoice_date > ‘01-02-2019‘ : uses implicit conversion
B) qty_sold =‘ 05549821 ‘ : requires explicit conversion
C) CONCAT(qty_sold, invoice_date) : reuires explicit conversion
D) qty_sold BETWEEN ‘101‘ AND ‘110‘ : uses implicit convesion
E) invoice_date = ‘15-march-2019‘ : uses implicit conversion
Answer：DE
(解析：D 答案中字符型是可以转换成数字型;E 的日期格式跟要求不一样，但是格式是兼容的，所以需要并且能够隐式转换。)
【2019年8月】OCP 071认证考试最新版本的考试原题-第19题
原文：https://www.cnblogs.com/cnblogs5359/p/11763781.html