将自定义值列表作为附加列添加到SQL查询的末尾

我执行了这样的查询

SELECT date_trunc('month', "submitted_at" AS "submitted_at", count(distinct "user_id") AS "count"
FROM table
GROUP BY date_trunc('month', "submitted_at")
ORDER BY date_trunc('month', "submitted_at") ASC

返回如下表（简化日期）

我想添加第三列，其中包含如下自定义值

Date         count   value 
may 2020       7       9
june 2020      9      17
july 2020     20      38
aug 2020      35      94
sep 2020      89      41
oct 2020     104      78

如何更改查询，以便添加额外的列并使用手动输入的值获取上表？我试过下面的方法，但运气不好。数据位于不同的数据库中，因此我无法直接连接数据。我还需要在不在数据库中创建任何新表的情况下执行此查询，因为我必须在各种情况下执行类似的查询，并且不能每次都创建表。这是在postgres数据库中，如果相关的话

SELECT date_trunc('month', "submitted_at" AS "submitted_at", count(distinct "user_id") AS "count", (9,17,38,94,41,78) as "value"
FROM table
GROUP BY date_trunc('month', "submitted_at")
ORDER BY date_trunc('month', "submitted_at") ASC

---

我将使用带有

值的
连接
：

SELECT date_trunc('month', "submitted_at") AS "submitted_at", 
       count(distinct "user_id") AS "count", 
       v.val as "value"
FROM table t LEFT JOIN
     (VALUES ('2020-05-01', 9),
             ('2020-06-01', 17),
             . . .
     ) v(mon, val)
     ON date_trunc('month', "submitted_at") = v.mon
GROUP BY date_trunc('month', "submitted_at"), v.val
ORDER BY date_trunc('month', "submitted_at") ASC;

我做出了一个似乎合理的假设，即您希望值按月份对齐。
令人惊讶的是，这起到了作用，我不得不删除了from子句中的t，并将v.val添加到group by，但其他方面都很好。谢谢
SELECT date_trunc('month', "submitted_at") AS "submitted_at", 
       count(distinct "user_id") AS "count", 
       v.val as "value"
FROM table t LEFT JOIN
     (VALUES ('2020-05-01', 9),
             ('2020-06-01', 17),
             . . .
     ) v(mon, val)
     ON date_trunc('month', "submitted_at") = v.mon
GROUP BY date_trunc('month', "submitted_at"), v.val
ORDER BY date_trunc('month', "submitted_at") ASC;