为了探索其他选择 -
以下是 BigQuery 标准 SQL
第一个示例是为每一行提取键:值对
#standardSQL
WITH `project.dataset.yourTbale` AS (
SELECT 1 AS id, '{"Weights":{"blue":1.0,"purple":0.0,"yellow":1.0,"green":1.0}}' AS json
UNION ALL SELECT 2, '{"Weights":{"blue":1.0,"red":2.0,"yellow":1.0,"orange":3.0}}'
)
SELECT id,
REPLACE(SPLIT(pair, ':')[OFFSET (0)], '"', '') color,
SAFE_CAST(SPLIT(pair, ':')[OFFSET (1)] AS FLOAT64) value
FROM `project.dataset.yourTbale`,
UNNEST(SPLIT(REGEXP_REPLACE(JSON_EXTRACT(json, '$.Weights'), r'{|}', ''))) pair
这给了你下面的结果
id color value
1 blue 1.0
1 purple 0.0
1 yellow 1.0
1 green 1.0
2 blue 1.0
2 red 2.0
2 yellow 1.0
2 orange 3.0
所以现在很容易扩展到你原来的问题,if there is a way to sum up all the values of the colors
甚至更多地扩展它,可能过滤特定的颜色 - 见下面的例子
#standardSQL
WITH `project.dataset.yourTbale` AS (
SELECT 1 AS id, '{"Weights":{"blue":1.0,"purple":0.0,"yellow":1.0,"green":1.0}}' AS json
UNION ALL SELECT 2, '{"Weights":{"blue":1.0,"red":2.0,"yellow":1.0,"orange":3.0}}'
)
SELECT id,
SUM(SAFE_CAST(SPLIT(pair, ':')[OFFSET (1)] AS FLOAT64)) AS total
FROM `project.dataset.yourTbale`,
UNNEST(SPLIT(REGEXP_REPLACE(JSON_EXTRACT(json, '$.Weights'), r'{|}', ''))) pair
WHERE REPLACE(SPLIT(pair, ':')[OFFSET (0)], '"', '') != 'blue'
GROUP BY id
结果如下(从计算中排除颜色=蓝色)
id total
1 2.0
2 6.0