11.View the Exhibit and examine the structure of the PRODUCTS table.

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#1z0-051 #oracle

探讨了在SQL查询中，当去除所有括号后对产品总价计算的影响。原查询旨在计算折扣及税费后的总价并加上固定运费。去除括号后会导致语法错误。

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11.View the Exhibit and examine the structure of the PRODUCTS table.
All products have a list price.
You issue the following command to display the total price of each product after a discount of 25% and a
tax of 15% are applied on it. Freight charges of $100 have to be applied to all the products.


SQL>SELECT prod_name, prod_list_price -(prod_list_price*(25/100))
+(prod_list_price -(prod_list_price*(25/100))*(15/100))+100
AS "TOTAL PRICE"
FROM products;


What would be the outcome if all the parenthese s are removed from the above statement?
A.It produces a syntax error.
B.The result remains unchanged.
C.The total price value would be lower than the correct value.
D.The total price value would be higher than the correct value.
答案：A
解析：这道题问的是如果所有的括号去掉，输出会是什么，也是考察优先级的
prod_list_price -(prod_list_price*(25/100))+(prod_list_price -(prod_list_price*(25/100))*(15/100))+100去掉括号后
prod_list_price -prod_list_price*25/100+prod_list_price -prod_list_price*25/100*15/100+100
可以看到，其实是没有影响的，所以选择A
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