按两个计数的划分结果排序

Question

我有一个像这样的查询：

SELECT
  type,
  count(case when STATUS = 'N/A' then 1 end) as NOTAPPLICABLE,
  count(case when STATUS = 'Failed' then 1 end) as FAILED,
  count(case when STATUS = 'No Run' then 1 end) as NO_RUN,
  count(case when STATUS = 'Not Completed' then 1 end) as NOT_COMPLETE,
  count(case when STATUS = 'Blocked' then 1 end) as Blocked,
  count(case when STATUS = 'Passed' then 1 end) as PASSED,
  count(case when STATUS <> 'N/A' then 1 end) as TOTAL

FROM
  table

GROUP BY
  type

我想订购结果，以便具有最高传递百分比类型的行位于顶部。

我虽然喜欢：

ORDER BY
  "PASSED"/"TOTAL" DESC

但它不起作用。

你有什么想法实现这个目标吗？

谢谢，

Answer 1

如果在SELECT中引用ORDER BY中定义的列别名，则必须单独使用它们。不在表达中。

您可以使用派生表。

SELECT *
FROM 
(
/* Your Query here*/
) T
ORDER BY PASSED/TOTAL DESC

您可能还需要将PASSED强制转换为数字，以避免整数除法，具体取决于您的DBMS。

Answer 2

您可以在ORDER BY

中使用表达式

SELECT
  type,
  count(case when STATUS = 'N/A' then 1 end) as NOTAPPLICABLE,
  count(case when STATUS = 'Failed' then 1 end) as FAILED,
  count(case when STATUS = 'No Run' then 1 end) as NO_RUN,
  count(case when STATUS = 'Not Completed' then 1 end) as NOT_COMPLETE,
  count(case when STATUS = 'Blocked' then 1 end) as Blocked,
  count(case when STATUS = 'Passed' then 1 end) as PASSED,
  count(case when STATUS <> 'N/A' then 1 end) as TOTAL

FROM
  table

GROUP BY
  type
ORDER BY 
  count(case when STATUS = 'Passed' then 1 end)/count(case when STATUS <> 'N/A' then 1 end) desc

但这可能会产生division by zero例外，你必须检查是否计数（STATUS＆lt;＆gt;'N / A'然后1结束时的情况）不为零。

另一种解决方案是使用子查询 - 您将初始查询包含在子查询中，然后您可以在SQL中将此子查询作为简单表进行排序，限制或过滤

SELECT * 
FROM (
    SELECT
      type,
      count(case when STATUS = 'N/A' then 1 end) as NOTAPPLICABLE,
      count(case when STATUS = 'Failed' then 1 end) as FAILED,
      count(case when STATUS = 'No Run' then 1 end) as NO_RUN,
      count(case when STATUS = 'Not Completed' then 1 end) as NOT_COMPLETE,
      count(case when STATUS = 'Blocked' then 1 end) as Blocked,
      count(case when STATUS = 'Passed' then 1 end) as PASSED,
      count(case when STATUS <> 'N/A' then 1 end) as TOTAL

    FROM
      table

    GROUP BY
      type
) AS SUB_DATA
ORDER BY PASSED/TOTAL DESC

如果您使用PostgreSQL，可以使用WITH构造（我非常喜欢）。

WITH _records as (
    SELECT
      type,
      count(case when STATUS = 'N/A' then 1 end) as NOTAPPLICABLE,
      count(case when STATUS = 'Failed' then 1 end) as FAILED,
      count(case when STATUS = 'No Run' then 1 end) as NO_RUN,
      count(case when STATUS = 'Not Completed' then 1 end) as NOT_COMPLETE,
      count(case when STATUS = 'Blocked' then 1 end) as Blocked,
      count(case when STATUS = 'Passed' then 1 end) as PASSED,
      count(case when STATUS <> 'N/A' then 1 end) as TOTAL

    FROM
      table

    GROUP BY
      type
)
SELECT * 
FROM _records
ORDER BY PASSED/TOTAL DESC

Answer 3

SELECT *, (PASSED / TOTAL) [percent] FROM
(   SELECT
      type,
      count(case when STATUS = 'N/A' then 1 end) as NOTAPPLICABLE,
      count(case when STATUS = 'Failed' then 1 end) as FAILED,
      count(case when STATUS = 'No Run' then 1 end) as NO_RUN,
      count(case when STATUS = 'Not Completed' then 1 end) as NOT_COMPLETE,
      count(case when STATUS = 'Blocked' then 1 end) as Blocked,
      count(case when STATUS = 'Passed' then 1 end) as PASSED,
      count(case when STATUS <> 'N/A' then 1 end) as TOTAL

    FROM
      table

    GROUP BY
      type ) T
ORDER BY [percent]

Answer 4

您的代码在sql server中工作，但我认为不在oracle中。尝试：

SELECT
  type,
  count(case when STATUS = 'N/A' then 1 end) as NOTAPPLICABLE,
  count(case when STATUS = 'Failed' then 1 end) as FAILED,
  count(case when STATUS = 'No Run' then 1 end) as NO_RUN,
  count(case when STATUS = 'Not Completed' then 1 end) as NOT_COMPLETE,
  count(case when STATUS = 'Blocked' then 1 end) as Blocked,
  count(case when STATUS = 'Passed' then 1 end) as PASSED,
  count(case when STATUS <> 'N/A' then 1 end) as TOTAL,
  count(case when STATUS = 'Passed' then 1 end) / count(case when STATUS <> 'N/A' then 1 end) as sort
FROM
  table

GROUP BY
  type
ORDER BY 9
  sort DESC

Answer 5

您的方法存在两个问题：

1. 正如其他人已经指出的那样，你不能使用列别名 计算。写ORDER BY PASSED/TOTAL DESC
而不是ORDER BY count(case when STATUS = 'Passed' then 1 end) / count(case when STATUS <> 'N/A' then 1 end)
2. 如果你将PASSED除以TOTAL，并且PASSED小于TOTAL，你就会 因此总是得到0。就像select 5/10将返回0一样 而不是0.5 - 因为两个值都是整数，所以你会得到整数。 select 1.0*5/10将返回0.5