16.Evaluate the following query: SQL> SELECT promo_name||q'{'s start date was }'||promo_begin_date A
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16.Evaluate the following query:
SQL> SELECT promo_name||q'{'s start date was }'||promo_begin_date AS "Promotion Launches" FROM promotions;
What would be the outcome of the above query?
A.It produces an error because flower braces have been used.
B.It produces an error because the data types are not matching.
C.It executes successfully and introduces an 's at the end of each promo_name in the output.
D.It executes successfully and displays the literal " {'s start date was } " for each row in the output.
答案：C
解析：这个考察的也是q前缀，q前缀可以参考13题
A：错误，这里说花括号已经使用
B：错误，说是数据类型不匹配
C：正确
D：错误，说是会显示{'s start date was }，肯定是不正确的
SQL> SELECT promo_name||q'{'s start date was }'||promo_begin_date AS "Promotion Launches" FROM promotions;
What would be the outcome of the above query?
A.It produces an error because flower braces have been used.
B.It produces an error because the data types are not matching.
C.It executes successfully and introduces an 's at the end of each promo_name in the output.
D.It executes successfully and displays the literal " {'s start date was } " for each row in the output.
答案：C
解析：这个考察的也是q前缀，q前缀可以参考13题
A：错误，这里说花括号已经使用
B：错误，说是数据类型不匹配
C：正确
D：错误，说是会显示{'s start date was }，肯定是不正确的
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