Sql 对某些分组行求和

我有一个数据集，显示了每类消费者的客人数量和收入，这些消费者访问了一次、两次、3次、4次、5次等

看起来是这样的：

我要得到上面的表的查询是：

选择交易数量，计数*作为客人计数，金额作为收入 从客户处开始计算 按编号分组 按编号订购

现在，我要将客人数量和收入相加，并将它们相加为以下类别：1、2、3、4、5-7和8+

所以实际上1，2，3，和4将保持不变，但我将在第5-7行和第8行及以后的行中求和

我该怎么做？我想要的表格如下，不要担心数值的准确性：

我希望我的问题被理解。

用例和子查询或CTE：

SELECT (CASE WHEN number_of_trans < 5 THEN CAST(number_of_trans as varchar)
             WHEN number_of_trans < 8 THEN '5-7'
             ELSE '8+'
        END) as grp,
       SUM(guest_count) as guest_count, SUM(revenue) as revenue
FROM (SELECT number_of_trans, COUNT(*) AS guest_count, SUM(amount) AS revenue
      FROM customer_counting
      GROUP BY number_of_trans
     ) x
GROUP BY grp
ORDER BY MIN(number_of_trans);

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戈登提案的更简单形式：

SELECT 
  CASE WHEN number_of_trans < 5 THEN cast(number_of_trans as varchar)
    WHEN number_of_trans < 8 THEN '5-7'
    ELSE '8+' 
  END as freq_band, 
  COUNT(*) AS guest_count, 
  SUM(amount) AS revenue 
FROM customer_counting 
GROUP BY CASE WHEN number_of_trans < 5 THEN cast(number_of_trans as varchar)
    WHEN number_of_trans < 8 THEN '5-7'
    ELSE '8+' 
  END
ORDER BY freq_band

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8+？@javacash附近不应该有引号吗。谢谢。我想如果把这个问题放到内部组中，可以使问题变得更简单？