GDELT:计算特定主题的出现次数
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【中文标题】GDELT:计算特定主题的出现次数【英文标题】:GDELT: count occurence of specific themes 【发布时间】:2020-11-10 09:25:50 【问题描述】:我试图计算术语“BITCOIN”在 GDELT 数据库的主题列中出现的频率,然后按日期对计数进行分组。这是我目前所拥有的:
SELECT DATE, SPLIT(RTRIM(Themes,';'),';') themes
FROM `gdelt-bq.gdeltv2.gkg_partitioned` WHERE _PARTITIONTIME >= "2020-11-01 00:00:00" AND _PARTITIONTIME < "2020-11-07 00:00:00"
#and (Themes like "%BITCOIN%")
#or (AllNames like "%bitcoin%" or AllNames like "%BITCOIN%")
and length(Themes) > 1
) select count(theme) cnt from nested, UNNEST(themes) as theme WHERE theme like "%BITCOIN%"
group by DATE
这是正确的方法吗?谢谢!
【问题讨论】:
【参考方案1】:以下是 BigQuery 标准 SQL
#standardsql
select date(_partitiontime) date, count(theme) occurences
from `gdelt-bq.gdeltv2.gkg_partitioned`, unnest(split(themes,';')) as theme
where _partitiontime >= "2020-11-01 00:00:00" and _partitiontime < "2020-11-07 00:00:00"
and lower(theme) like "%bitcoin%"
group by date
-- order by date
有输出
【讨论】:
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