我在postgres:中有一个jsonb对象
[{"a": 1, "b":5}, {"a":2, "c":3}]
我想得到每个唯一密钥的总和:
{"a":3, "b":5, "c":3}
关键是不可预测的。
有可能在Postgres中使用select语句来实现这一点吗?
查询:
SELECT key, SUM(value::INTEGER)
FROM (
SELECT (JSONB_EACH_TEXT(j)).*
FROM JSONB_ARRAY_ELEMENTS('[{"a": 1, "b":5}, {"a":2, "c":3}]') j
) j
GROUP BY key
ORDER BY key;
结果:
| key | sum |
| --- | --- |
| a | 3 |
| b | 5 |
| c | 3 |
DB Fiddle