我在Google Cloud BigQuery中有一个包含两列的表:第一列是日期,第二列是布尔值。我按照日期排序。现在我只想添加两列: 1.简单地计算每行之前的行数:1,2,3,... 2.计算每行之前具有TRUE值的行数(运行总和为True)。 我如何在SQL中执行此操作? 以下显示了解释我的意思的所有列:
答案 0 :(得分:4)
以下是BigQuery Standard SQL
#standardSQL
WITH `project.dataset.table` AS (
SELECT '2018-01-01' dt, TRUE value UNION ALL
SELECT '2018-01-07', FALSE UNION ALL
SELECT '2018-01-09', TRUE UNION ALL
SELECT '2018-02-02', TRUE UNION ALL
SELECT '2018-02-19', FALSE UNION ALL
SELECT '2018-03-02', FALSE UNION ALL
SELECT '2018-03-09', FALSE UNION ALL
SELECT '2018-04-28', TRUE
)
SELECT *,
COUNT(1) OVER(ORDER BY dt) count_previous_all,
COUNTIF(value) OVER(ORDER BY dt) count_previous_true
FROM `project.dataset.table`
ORDER BY dt
结果为
Row dt value count_previous_all count_previous_true
1 2018-01-01 true 1 1
2 2018-01-07 false 2 1
3 2018-01-09 true 3 2
4 2018-02-02 true 4 3
5 2018-02-19 false 5 3
6 2018-03-02 false 6 3
7 2018-03-09 false 7 3
8 2018-04-28 true 8 4