[英]Column name is ambiguous in bigquery
我正在實施以下解決方案: https ://stackoverflow.com/a/32663098/19903400
這是我從接受的答案中復制的代碼,而是使用我的數據源:
SELECT
date,
SUM(CASE WHEN period = 7 THEN users END) as days_07,
SUM(CASE WHEN period = 14 THEN users END) as days_14,
SUM(CASE WHEN period = 30 THEN users END) as days_30
FROM (
SELECT
dates.date as date,
periods.period as period,
EXACT_COUNT_DISTINCT(activity.user_pseudo_id) as users
FROM `rayn-deen-app.analytics_317927526.events_*` as activity
CROSS JOIN (SELECT DATE_TRUNC(EXTRACT(DATE from TIMESTAMP_MICROS(event_timestamp)), DAY) as date FROM `rayn-deen-app.analytics_317927526.events_*` GROUP BY date) as dates
CROSS JOIN (SELECT period FROM (SELECT 7 as period),
(SELECT 14 as period),(SELECT 30 as period)) as periods
WHERE dates.date >= activity.date
AND INTEGER(FLOOR(DATEDIFF(dates.date, activity.date)/periods.period)) = 0
GROUP BY 1,2
)
GROUP BY date
ORDER BY date DESC
但我收到以下錯誤:
Column name period is ambiguous at [13:22]
所以這里似乎是有問題的代碼片段:
CROSS JOIN (SELECT period FROM (SELECT 7 as period),
(SELECT 14 as period),(SELECT 30 as period)) as periods
如果目標是擁有一組固定的記錄,那么您可以將其替換為:
SELECT period FROM (SELECT 7 as period),
(SELECT 14 as period),(SELECT 30 as period)
有了這個:
SELECT period FROM (SELECT 7 as period UNION ALL
SELECT 14 UNION ALL
SELECT 30)
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