Postgresql Postgres JSON_AGG和订单不一起工作

我有一个如下的查询：

SELECT *,
(SELECT json_agg(deals.*) FROM deals WHERE vendors.id = deals.vendorid) as deals
FROM vendors

SELECT *,
(SELECT json_agg(deals.*) FROM deals WHERE vendors.id = deals.vendorid ORDER BY priority) as deals
FROM vendors

但是，当我尝试按

deals

表中的字段排序时，该查询非常有效，如下所示：

SELECT *,
(SELECT json_agg(deals.*) FROM deals WHERE vendors.id = deals.vendorid) as deals
FROM vendors

SELECT *,
(SELECT json_agg(deals.*) FROM deals WHERE vendors.id = deals.vendorid ORDER BY priority) as deals
FROM vendors

我得到以下错误：

error: column "deals.priority" must appear in the GROUP BY clause or be used in an aggregate function

---

你知道如何进行这样的排序吗？

语法不应该是这样的吗

(SELECT json_agg(deals.*) WITHIN GROUP (ORDER BY priority)
 FROM deals
 WHERE vendors.id = deals.vendorid 
) as deals

文档是。

您可以

SELECT *,
(SELECT json_agg(deals.* ORDER BY priority) FROM deals WHERE vendors.id = deals.vendorid) as deals
FROM vendors

---

请参阅。

这很好，我觉得比其他选项短。我很惊讶组内的

与
json\u agg
一起工作…？