Question

我有一个包含两列Bin_name（int）和Count_in_this_bin（int）的简单表

我想将其转换为每个bin与所有bin中总计数的比率。

我在Google BigQuery中使用了以下查询：

SELECT count_in_bin/(SELECT SUM(count_in_bin) FROM [table])
FROM [table]

然后我得到

错误：查询失败错误：SELECT子句
中不允许进行子选择

任何人都可以让我现在正确的方法在BigQuery中做这种简单的划分吗？

Answer 1

BigQuery Legacy SQL

#legacySQL
SELECT 
  count_in_bin, 
  RATIO_TO_REPORT(count_in_bin) OVER() AS ratio
FROM [project:dataset.table]

BigQuery标准SQL

#standardSQL
SELECT 
  count_in_bin, 
  count_in_bin / total AS ratio
FROM `project.dataset.table`, 
(SELECT SUM(count_in_bin) total FROM `project.dataset.table`)

Answer 2

您正在寻找窗口/分析功能。在标准SQL中，这将是：

SELECT count_in_bin / SUM(count_in_bin) OVER () 
FROM [table]

在旧版SQL中，您似乎需要一个子查询：

SELECT count_in_bin, count_in_bin / total_count_in_bin
FROM (SELECT count_in_bin, SUM(count_in_bin) OVER () as total_count_in_bin
      FROM [table]
     ) t

BigQuery：除以列中的值之和以查找比率

2 个答案: