Postgres 9.4：在SELECT上的jsonb数组中包含同级列

如果我有这样一张桌子：

office_id int
employees jsonb

1
[{ "name" : "John" }, { "name" : "Jane" }]

office_id,employees
1,[{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]

id  employees
1   [{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]
2   [{ "name" : "Jamal", "office_id" : 1 }]

数据如下所示：

office_id int
employees jsonb

1
[{ "name" : "John" }, { "name" : "Jane" }]

office_id,employees
1,[{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]

id  employees
1   [{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]
2   [{ "name" : "Jamal", "office_id" : 1 }]

是否有一种简单的查询方法，以使结果如下所示：

office_id int
employees jsonb

1
[{ "name" : "John" }, { "name" : "Jane" }]

office_id,employees
1,[{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]

id  employees
1   [{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]
2   [{ "name" : "Jamal", "office_id" : 1 }]

例如，查看以下SQLFIDLE：

结果应该是这样的：

office_id int
employees jsonb

1
[{ "name" : "John" }, { "name" : "Jane" }]

office_id,employees
1,[{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]

id  employees
1   [{ "name" : "John", "office_id" : 1 }, { "name" : "Jane", "office_id" : 1 }]
2   [{ "name" : "Jamal", "office_id" : 1 }]

我一直在通读这本书，似乎这是可能的，但我似乎无法理解。我宁愿不必在每个嵌套对象上存储office_id

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注意：这与类似，但所需的输出不同。

我不确定您是从Postgres表还是json对象表中选择。可以使用json_agg（）执行普通查询并将其转换为json

以下是一个普通查询：

ao_db=# SELECT * FROM record.instance;
                  id                  | created_by |          created_on           | modified_by |          modified_on          
--------------------------------------+------------+-------------------------------+-------------+-------------------------------
 18d8ca56-87b6-11e5-9c15-48d22415d991 | sysop      | 2015-11-10 23:19:47.181026+09 | sysop       | 2015-11-10 23:19:47.181026+09
 190a0e86-87b6-11e5-9c15-48d22415d991 | sysop      | 2015-11-10 23:19:47.56517+09  | sysop       | 2015-11-10 23:19:47.56517+09
 57611c9c-87b6-11e5-8c4b-48d22415d991 | admin      | 2015-11-10 23:21:32.399775+09 | admin       | 2015-11-10 23:22:27.975266+09
(3 行)

下面是通过json_agg（）传递的相同查询：

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你能提供更清晰的样本数据吗<代码>创建表和插入语句？现在看起来就像是从my_表中选择office_id，employees