我需要在列中组织查询结果,就像它是一个数据透视表一样。我怎么能这样做?
答案 0 :(得分:10)
使用条件语句将查询结果组织成行和列。在下面的示例中,搜索大多数以“Google”值开头的维基百科文章的结果将被组织到列中,如果它们符合各种条件,则会显示修订计数。
SELECT
page_title,
/* Populate these columns as True or False, depending on the condition */
IF(page_title CONTAINS 'search', INTEGER(total), 0) AS search,
IF(page_title CONTAINS 'Earth' OR page_title CONTAINS 'Maps', INTEGER(total), 0) AS geo,
FROM
/* Subselect to return top revised Wikipedia articles containing 'Google'
* followed by additional text.
*/
(SELECT
TOP(title, 5) as page_title,
COUNT(*) as total
FROM
[publicdata:samples.wikipedia]
WHERE
REGEXP_MATCH (title, r'^Google.+') AND wp_namespace = 0
);
结果:
+---------------+--------+------+
| page_title | search | geo |
+---------------+--------+------+
| Google search | 4261 | 0 |
| Google Earth | 0 | 3874 |
| Google Chrome | 0 | 0 |
| Google Maps | 0 | 2617 |
| Google bomb | 0 | 0 |
+---------------+--------+------+
一个类似的例子,不使用子查询:
SELECT SensorType, DATE(DTimestamp), AVG(data) avg,
FROM [data-sensing-lab:io_sensor_data.moscone_io13]
WHERE DATE(DTimestamp) IN ('2013-05-16', '2013-05-17')
GROUP BY 1, 2
ORDER BY 2, 3 DESC;
生成3列表:传感器类型,日期和平均数据。要“转动”并将日期作为列:
SELECT
SensorType,
AVG(IF(DATE(DTimestamp) = '2013-05-16', data, null)) d16,
AVG(IF(DATE(DTimestamp) = '2013-05-17', data, null)) d17
FROM [data-sensing-lab:io_sensor_data.moscone_io13]
GROUP BY 1
ORDER BY 2 DESC;
答案 1 :(得分:0)
相同的方法/结果,但使用BigQuery Standard SQL:
-- top revised Wikipedia articles containing 'Google'
WITH articles AS (
SELECT title AS page_title,
COUNT(*) AS total
FROM `publicdata.samples.wikipedia`
WHERE REGEXP_CONTAINS(title, r'^Google.+') AND wp_namespace = 0
GROUP BY title
ORDER BY total DESC
LIMIT 5
)
SELECT page_title,
-- Populate these columns as True or False, depending on the condition
IF(page_title LIKE '%search%', total, 0) AS search,
IF(page_title LIKE '%Earth%' OR page_title LIKE '%Maps%', total, 0) AS geo
FROM articles
;