CASE Athena Presto 上的多个值

Question

我正在寻求一些建议。

我希望将多个值编码到同一个输出，但 Athena 似乎无法识别 SQL。

CASE customer_name
WHEN 'Aa' or 'Ar' or 'Aar' or 'Aaro' THEN 'Aaron' END as customer_name

我想避免做以下事情：

CASE customer_name
WHEN 'Aa' THEN 'Aaron'
WHEN 'Ar' THEN 'Aaron'
WHEN 'Ar' THEN 'Aaron'
WHEN 'Ar' THEN 'Aaron'
END as customer_name

Answer 1

您可以将字段移到“WHEN”子句中：

WITH dataset ( customer_name) AS
(
  VALUES
      ('Aa'),
  ('Ar'),
  ('Ar'),
  ('Ar'),
  ('B')
)

 SELECT
    CASE
        WHEN customer_name IN ('Aa', 'Ar', 'Aar', 'Aaro') THEN 'Aaron'
    END AS customer_name
FROM dataset

输出：

customer_name
Aaron
Aaron
Aaron
Aaron