Mysql 尝试使用CASE语句增加以下列的值

这是我编写的代码，但是当我执行它时抛出错误的语法错误，我能知道我犯了什么错误吗，谢谢

SELECT CASE
   WHEN RATING = 'VERY_POOR' THEN 1 ELSE 0
   END 'VERYPOOR',
   WHEN RATING = 'POOR' THEN 1 ELSE 0
   END 'POOR',
   WHEN RATING = 'AVERAGE' THEN 1 ELSE 0
   END 'AVERAGE',
   WHEN RATING = 'GOOD' THEN 1 ELSE 0
   END 'GOOD',
   WHEN RATING = 'VERY_GOOD' THEN 1 ELSE 0
   END 'VERYGOOD'
+--------------+-----------+------+---------+------+-----------+-------------+--------------------+----------------+-----------+
| RESPONSEDATE | VERY_POOR | POOR | AVERAGE | GOOD | VERY_GOOD | CSAT_RATING | CATEGORY_WEIGHTAGE | CATEGORYNAME   | CSATSCORE |
+--------------+-----------+------+---------+------+-----------+-------------+--------------------+----------------+-----------+
| 2018-04-03   |         0 |    0 |       1 |    0 |         0 |           3 |                  0 | Overall Rating |         3 |
| 2018-04-03   |         0 |    0 |       0 |   32 |         0 |           4 |                  0 | Overall Rating |         4 |
| 2018-04-03   |         0 |    0 |       0 |    0 |        28 |           5 |                  0 | Overall Rating |         5 |
| 2018-04-04   |         0 |    0 |       6 |    0 |         0 |           3 |                  0 | Overall Rating |         3 |
| 2018-04-04   |         0 |    0 |       0 |   44 |         0 |           4 |                  0 | Overall Rating |         4 |
| 2018-04-04   |         0 |    0 |       0 |    0 |        32 |           5 |                  0 | Overall Rating |         5 |
| 2018-04-05   |         0 |    0 |       2 |    0 |         0 |           3 |                  0 | Overall Rating |         3 |
| 2018-04-05   |         0 |    0 |       0 |   14 |         0 |           4 |                  0 | Overall Rating |         4 |
| 2018-04-05   |         0 |    0 |       0 |    0 |        11 |           5 |                  0 | Overall Rating |         5 |
+--------------+-----------+------+---------+------+-----------+-------------+--------------------+----------------+----------

---

大小写

语法应如下所示：

CASE 
    WHEN Condition1 THEN Value1
    WHEN Condition2 THEN Value2
    ELSE Value3
END

如果需要编写多个

案例

，则需要重复整个结构（如果需要，可以使用不同的列别名）

您的问题是在第一个

案例

之后缺少关键字“

案例

”

SELECT 
    CASE WHEN RATING = 'VERY_POOR' THEN 1 ELSE 0 END 'VERYPOOR',
    CASE WHEN RATING = 'POOR' THEN 1 ELSE 0 END 'POOR',
    CASE WHEN RATING = 'AVERAGE' THEN 1 ELSE 0 END 'AVERAGE',
    CASE WHEN RATING = 'GOOD' THEN 1 ELSE 0 END 'GOOD',
    CASE WHEN RATING = 'VERY_GOOD' THEN 1 ELSE 0 END 'VERYGOOD'

-- FROM ....

---

你想完成什么？你能包括样本数据和预期输出吗？语法错误是什么？最终，您没有正确嵌套

CASE

语句，但很难确定预期行为是什么。+是一个算术运算符，在这里不合适。我不清楚你想做什么，你能通过在问题中添加样本数据和预期结果作为文本来说明吗？请给我们一个样本数据集和你的样本结果，请参阅RESPONSEDATE列here@kchason谢谢，语法错误是我没有使用case语句。

SELECT 
    CASE WHEN RATING = 'VERY_POOR' THEN 1 ELSE 0 END 'VERYPOOR',
    CASE WHEN RATING = 'POOR' THEN 1 ELSE 0 END 'POOR',
    CASE WHEN RATING = 'AVERAGE' THEN 1 ELSE 0 END 'AVERAGE',
    CASE WHEN RATING = 'GOOD' THEN 1 ELSE 0 END 'GOOD',
    CASE WHEN RATING = 'VERY_GOOD' THEN 1 ELSE 0 END 'VERYGOOD'

-- FROM ....