[英]Aggregate JSON in PostgreSQL
I have a json column with entries that look like this:我有一个 json 列,其条目如下所示:
{
"pages": "64",
"stats": {
"1": { "200": "55", "400": "4" },
"2": { "200": "1" },
"3": { "200": "1", "404": "13" },
}
}
The 'stats' are collections (of various sizes) containing http status codes versus counts. “统计”是 collections(各种大小),包含 http 状态代码与计数。
I would like to aggregate the stats into two calculated columns - one for the total number of 200
responses and the other for the total number of responses (including 200
s).我想将统计信息汇总到两个计算列中 - 一个用于
200
响应的总数,另一个用于响应的总数(包括200
)。
You can use two lateral joins to unnest the inner objects, then do conditional aggregation:您可以使用两个横向连接来取消嵌套内部对象,然后进行条件聚合:
select
sum(z.cnt::int) no_responses,
sum(z.cnt::int) filter(where z.code::int = 200) no_200_responses
from mytable t
cross join lateral jsonb_each(t.data -> 'stats') as x(kx, obj)
cross join lateral jsonb_each_text(x.obj) as z(code, cnt)
Demo on DB Fiddle : DB Fiddle 上的演示:
no_responses | no_200_responses -----------: | ---------------: 74 | 57
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