复杂 JSON B 聚合与 GROUP BY

Question

我有一个table像这样的东西

STUDENT             JSONB Column 
1                    {"total":8,"healthy": 2,"unhealthy":5,"X":7}                  
1                    {"total":12,"healthy": 4"unhealthy":3,"X":9}    
2                    {"total":3,"healthy": 4}  
2                    {"total":4,"healthy": 1}

预计

1                    {"total":20,"healthy": 6,"unhealthy":8,"X":16}    
2                    {"total":7,"healthy": 5}

我想对 JSON 内的值进行分组和求和。我尝试使用 JSONB_OBJ_AGG 我知道如何让它与硬编码一起工作。但我的问题是键数可以是 6-9。我无法在 SQL.

中对键进行硬编码

Answer 1

您可以像这样使用 jsonb_object_agg 函数来获取所有键的总和而无需声明它们：

select id,  jsonb_object_agg(key, sum)  from
(
    select   id, key, sum(value::int)
    from my_table 
    cross join jsonb_each_text(content)
    group by id, key
) tmp_each group by id

演示在 DBfiddle

复杂 JSON B 聚合与 GROUP BY

Complex JSON B aggregation with GROUP BY

postgresql

jsonb