在postgresql(10.3)中,在单独的行和列中取消测试和插入json数据
我有以下数据集:在postgresql(10.3)中,在单独的行和列中取消测试和插入json数据,postgresql,postgresql-10,Postgresql,Postgresql 10,我有以下数据集: {"date":{"year":2017,"month":7,"day":2},"data":{"param1":[10,20,30,440],"param2":[55,65,75,85],"param3":[43,55,71,72]}} 我从一个名为rawData的表中检索数据 现在,我想取消数组中的值,并将它们放在另一个表(SeparateData)中的4个单独的行和列中,因此在本例中,它看起来像: year | month | day | param1 | param
{"date":{"year":2017,"month":7,"day":2},"data":{"param1":[10,20,30,440],"param2":[55,65,75,85],"param3":[43,55,71,72]}}
我从一个名为rawData的表中检索数据
现在,我想取消数组中的值,并将它们放在另一个表(SeparateData)中的4个单独的行和列中,因此在本例中,它看起来像:
year | month | day | param1 | param2 | param3
2017 7 2 10 55 43
2017 7 2 20 65 55
2017 7 2 30 75 71
2017 7 2 440 85 72
我猜我必须使用最不寻常的方式来实现这一点,但我仍在思考应该如何继续。数组param1、param2、param3的长度始终相同
我已经对数据进行了修改:
正确地说,这不是最好的方法。我的PostgreSQL体验不是很好,但很有效 查询
SELECT
((rawData.values)::json->'date')::json->'year' AS year
, ((rawData.values)::json->'date')::json->'month' AS month
, ((rawData.values)::json->'date')::json->'day' AS day
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param1') AS param1
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param2') AS param2
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param3') AS param3
FROM
rawData
SELECT
((rawData.values)::json->'date')::json->'year' AS year
, ((rawData.values)::json->'date')::json->'month' AS month
, ((rawData.values)::json->'date')::json->'day' AS day
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param1') AS param1
, GENERATE_SERIES(1, JSON_ARRAY_LENGTH(((rawData.values)::json->'data')::json->'param1')) AS param1_array_index
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param2') AS param2
, GENERATE_SERIES(1, JSON_ARRAY_LENGTH(((rawData.values)::json->'data')::json->'param2')) AS param2_array_index
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param3') AS param3
, GENERATE_SERIES(1, JSON_ARRAY_LENGTH(((rawData.values)::json->'data')::json->'param3')) AS param3_array_index
FROM
rawData
演示
当数组param1、param2、param3的长度不相等时,查询也可以工作
演示
谢谢你的回答,到目前为止还有效。我唯一忘记的是,我 实际上也需要索引作为一个单独的列。那么 数组元素。有什么想法吗 这可以通过GENERATE_SERIES与JSON_ARRAY_LENGTH结合使用 查询
SELECT
((rawData.values)::json->'date')::json->'year' AS year
, ((rawData.values)::json->'date')::json->'month' AS month
, ((rawData.values)::json->'date')::json->'day' AS day
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param1') AS param1
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param2') AS param2
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param3') AS param3
FROM
rawData
SELECT
((rawData.values)::json->'date')::json->'year' AS year
, ((rawData.values)::json->'date')::json->'month' AS month
, ((rawData.values)::json->'date')::json->'day' AS day
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param1') AS param1
, GENERATE_SERIES(1, JSON_ARRAY_LENGTH(((rawData.values)::json->'data')::json->'param1')) AS param1_array_index
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param2') AS param2
, GENERATE_SERIES(1, JSON_ARRAY_LENGTH(((rawData.values)::json->'data')::json->'param2')) AS param2_array_index
, JSON_ARRAY_ELEMENTS(((rawData.values)::json->'data')::json->'param3') AS param3
, GENERATE_SERIES(1, JSON_ARRAY_LENGTH(((rawData.values)::json->'data')::json->'param3')) AS param3_array_index
FROM
rawData
请参见演示您使用的PostgreSQL版本是什么?@RaymondNijland我使用的是10.3版谢谢您的回答,目前为止它还可以使用。我唯一忘记的是,我实际上也需要索引作为一个单独的列。所以数组元素的索引。有什么想法吗?“谢谢你的回答,到目前为止它很有效。我唯一忘记的是,我实际上也需要索引作为一个单独的列。所以数组元素的索引。有什么想法吗?”@web_student我已经更新了我的答案。。您可能需要将
GENERATE_SERIES(1,…)
更改为GENERATE_SERIES(0,…)
,因为数组索引通常以0开头