Sql 带有UNNEST、LEFT JOIN和WHERE语句的Bigquery
以下带有UNNEST和LEFT JOIN的查询将添加带有日期的空0行:Sql 带有UNNEST、LEFT JOIN和WHERE语句的Bigquery,sql,google-bigquery,Sql,Google Bigquery,以下带有UNNEST和LEFT JOIN的查询将添加带有日期的空0行: SELECT cal_day, count(e.datetime) AS cnt FROM UNNEST( GENERATE_DATE_ARRAY(DATE('2018-12-10'), CURRENT_DATE(), INTERVAL 1 DAY) ) AS cal_day LEFT JOIN `eventlogs` e ON cal_day = CAST( T
SELECT cal_day, count(e.datetime) AS cnt
FROM UNNEST(
GENERATE_DATE_ARRAY(DATE('2018-12-10'), CURRENT_DATE(), INTERVAL 1 DAY)
) AS cal_day
LEFT JOIN `eventlogs` e
ON cal_day = CAST( TIMESTAMP_MICROS( CAST(CAST(e.datetime AS NUMERIC)*1000 AS INT64)) AS DATE)
# WHERE ( CAST(datetime AS NUMERIC) > 1544375081371.431 ) AND message LIKE '%mymessage%'
GROUP BY cal_day
ORDER BY cal_day
LIMIT 10000
结果致:
1 2018-12-10 00:00:00 UTC 561
2 2018-12-11 00:00:00 UTC 1473
3 2018-12-12 00:00:00 UTC 650
4 2018-12-13 00:00:00 UTC 407
5 2018-12-14 00:00:00 UTC 283
6 2018-12-15 00:00:00 UTC 1
6 2018-12-16 00:00:00 UTC 0
7 2018-12-17 00:00:00 UTC 213
8 2018-12-18 00:00:00 UTC 583
当我添加WHERE子句时,情况并非如此。如何将message='mymessage'添加到unnest中,以便在WHERE中获得0个计数日期
#standardSQL
SELECT cal_day, IFNULL(cnt, 0) AS cnt
FROM UNNEST(
GENERATE_DATE_ARRAY(DATE('2018-12-10'), CURRENT_DATE(), INTERVAL 1 DAY)
) AS cal_day
LEFT JOIN (
SELECT
CAST( TIMESTAMP_MICROS( CAST(CAST(datetime AS NUMERIC)*1000 AS INT64)) AS DATE) AS day,
COUNT(datetime) AS cnt
FROM `eventlogs`
WHERE (CAST(datetime AS NUMERIC) > 1544375081371.431 )
AND message LIKE '%mymessage%'
GROUP BY day
) e
ON cal_day = e.day
ORDER BY cal_day
LIMIT 10000
如您所见,我刚刚将过滤逻辑移到了subselect中