本文详细解析了一条复杂的SQL查询语句，展示了如何在输出中动态插入字符串和日期，通过实际运行结果验证了正确性。这不仅是一次SQL语法的学习，也是对数据库操作深入理解的机会。
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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.
Answer: C
答案解析：
参考13题：http://blog.youkuaiyun.com/rlhua/article/details/16336797
实验验证：
sh@TEST1107> SELECT promo_name|| q'{'s start date was }'|| promo_begin_date AS "Promotion Launches" FROM promotions;
Promotion Launches
------------------------------------------------------------------
NO PROMOTION #'s start date was 01-JAN-99
newspaper promotion #16-108's start date was 23-DEC-00
post promotion #20-232's start date was 25-SEP-98
newspaper promotion #16-349's start date was 10-JUL-98
internet promotion #14-471's start date was 26-FEB-00
TV promotion #13-448's start date was 06-AUG-00
分享一下我老师大神的人工智能教程。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.youkuaiyun.com/jiangjunshow
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