首先,我非常喜欢初级""因此,我不确定我所要求的是否可行,但我会尽我所能解释,并感谢所提供的任何帮助。
下面是两个非常基本的表格,用于为我的问题添加视觉效果。第一个只列出了测试题,多项选择答案是正确的,以及可能的答案。第二个显示问题,正确的多项选择答案,选择的多项选择答案以及回答的人:
+---------------------------------------------------------------------------------+
| Test Questions |
+-----------------------------+--------+----------+----------+----------+---------+
| id | QuestionText | Answer | AnswerA | AnswerB | Answer C | Answer D|
+----+------------------------+--------+----------+----------+----------+---------+
| 1 | What Color is the Sky? | C | Red | Green | Blue | Purple |
+----+------------------------+--------+----------+----------+----------+---------+
| 2 | What has one wheel? | A | Unicycle | Tricycle | Bike | Car |
+----+------------------------+--------+----------+----------+----------+---------+
| 3 | Who is the President? | B | Bush | Obama | Clinton | Kennedy |
+----+------------------------+--------+----------+----------+----------+---------+
+---------------------------------------------------------+
| Test Results |
+-----------------------------+--------+----------+-------+
| id | QuestionText | Answer | Response | EE |
+----+------------------------+--------+----------+-------+
| 1 | What Color is the Sky? | C | A | Bill |
+----+------------------------+--------+----------+-------+
| 2 | What has one wheel? | A | A | Bill |
+----+------------------------+--------+----------+-------+
| 3 | Who is the President? | B | D | Bill |
+----+------------------------+--------+----------+-------+
| 4 | What Color is the Sky? | C | C | Susie |
+----+------------------------+--------+----------+-------+
| 5 | What has one wheel? | A | B | Susie |
+----+------------------------+--------+----------+-------+
| 6 | Who is the President? | B | A | Susie |
+----+------------------------+--------+----------+-------+
加入表后,我想根据Answer列中的字母将Answer列与AnswerA列,AnswerB列等结合起来。很像这样:
+----------------------------------------------------------------+
| Test Results |
+-----------------------------+---------------+----------+-------+
| id | QuestionText | CorrectAnswer | Response | EE |
+----+------------------------+---------------+----------+-------+
| 1 | What Color is the Sky? | C Blue | A | Bill |
+----+------------------------+---------------+----------+-------+
| 2 | What has one wheel? | A Unicycle | A | Bill |
+----+------------------------+---------------+----------+-------+
| 3 | Who is the President? | B Obama | D | Bill |
+----+------------------------+---------------+----------+-------+
有什么建议吗?
答案 0 :(得分:1)
使用CASE
表达式。
SELECT CASE Answer
WHEN 'A' THEN AnswerA
WHEN 'B' THEN AnswerB
WHEN 'C' THEN AnswerC
ELSE AnswerD
END as CorrectAnswerText
FROM JoinedTable
确定连接的语法是一个练习。 :)