错误：“ WHEN”位置处或附近的语法错误

Question

此查询出了什么问题？

SELECT *,
CASE
WHEN Step=6 THEN "#SQ1_1" END,
WHEN Step= 12 THEN "#SQ1_2"
ELSE Col_A
END AS "Layers"
FROM my_table

Answer 1

第三行中的END,似乎有点过多。正确的格式化代码有很大帮助。

只需尝试：

SELECT *
      ,CASE WHEN Step = 6 
              THEN "#SQ1_1"
            WHEN Step = 12 
              THEN "#SQ1_2"
            ELSE Col_A
       END AS "Layers"
  FROM my_table