如何查询 Cosmos DB 以查找不同条件下项目的 SUM？

Question

这是我的 Cosmos 数据库中的一个示例项目：

{
    "id": "a683-89e01def5310",
    "assignmentId": "123",
    "auctionSiteId": 100,
    "status": "Scheduled",
...
}

当我编写这个基本查询并运行它时没有问题：

SELECT VALUE 
    COUNT(c.id)
FROM 
    c
WHERE 
    c.auctionSiteId = 100 AND c.status = "Scheduled"

我得到了正确的结果。然而，当我让一次性为多个站点计算相同的事情变得有点复杂时，我就不这么认为了。这是我的查询：

with temp as (
  select c.auctionSiteId from c
  where c.status = "Scheduled"
),
logic as(
  select
    case when c.auctionSiteId = 96 then 1 else 0 end as count_montreal,
    case when c.auctionSiteId = 97 then 1 else 0 end as count_vancouver,
    case when c.auctionSiteId = 98 then 1 else 0 end as count_calgary,
    case when c.auctionSiteId = 99 then 1 else 0 end as count_edmonton,
    case when c.auctionSiteId = 100 then 1 else 0 end as count_toronto,
    
  from temp
)
select
  sum(count_montreal) as countMontreal,
  sum(count_vancouver) as countVancouver,
  sum(count_calgary) as countCalgary,
  sum(count_edmonton) as countEdmonton,
  sum(count_toronto) as countToronto,
from logic

这是我收到的错误消息：

{"code":"BadRequest","message":"One of the input values is invalid.\r\nActivityId: 5a1a98e3-aca1-40b4-8378-6cd5b4ba2bbf, Wind...

Answer 1

SELECT 
    SUM(c.auctionSiteId = 13 ?1:0) AS countMontreal,
    SUM(c.auctionSiteId = 15 ?1:0) AS countVancouver,
    SUM(c.auctionSiteId = 35 ?1:0) AS countCalgary,
    SUM(c.auctionSiteId = 54 ?1:0) AS countEdmonton,
    SUM(c.auctionSiteId = 60 ?1:0) AS countToronto
FROM c
WHERE c.status = "Scheduled"

希望这有帮助。 Cosmos 与 SQL 不同，不支持 case when 语法。建议使用 三元运算符 代替