Postgres案例陈述错误

Question

我正在尝试创建一个基于职位发布状态的Postgres案例陈述。例如：

• 当status为'Closed'时，我希望updated_at时间戳与created_at时间戳之间的天数存在差异。
• 当status为'Open'或'Pending'时，我想从当前时间戳中减去created_at时间戳。

我到目前为止创建的查询如下所示：

Select users.first_name || " " || users.last_name,
users.email,
organizations.name,
organizations.vertical,
jobs.name,
jobs.id
(Case
When jobs.status = 'Closed' Then jobs.updated_at - jobs.created_at Else 'Not Closed') END AS days_to_hire,
(Case
When jobs.status IN ('Open,'Pending') Then current_timestamp - jobs.created_at Else 'Closed_or_Deleted') END AS days_open,
FROM organizations
JOIN users on organizations.id = users.organization_id
JOIN jobs on user.id= jobs.user.id

但是，它并不像我预期的那样有效：

  

错误：语法错误位于或附近“）”

我无法找出原因。

非常感谢任何帮助。

Answer 1

简答

您的查询中有三个语法问题：

1. 缺少逗号
2. 在您的CASE对帐单
中放错了右括号
3. 第二个CASE声明
中未终止的字符串文字

我已在下面注明：

Select users.first_name || " " || users.last_name,
users.email,
organizations.name,
organizations.vertical,
jobs.name,
-- Missing comma added below.
jobs.id,
--jobs.id
-- Closing paren moved to after `END` below.
(Case
When jobs.status = 'Closed' Then jobs.updated_at - jobs.created_at Else 'Not Closed' END) AS days_to_hire, 
--(Case
--When jobs.status = 'Closed' Then jobs.updated_at - jobs.created_at Else 'Not Closed') END AS days_to_hire,
-- Closing paren moved to after `END` and a closing single quote added
-- to terminate the string literal 'Open' below.
(Case
When jobs.status IN ('Open','Pending') Then current_timestamp - jobs.created_at Else 'Closed_or_Deleted' END) AS days_open,
--(Case
--When jobs.status IN ('Open,'Pending') Then current_timestamp - jobs.created_at Else 'Closed_or_Deleted') END AS days_open,
FROM organizations
JOIN users on organizations.id = users.organization_id
JOIN jobs on user.id= jobs.user.id

附录

同样，您的查询很难以格式化的方式阅读。这使得调试变得更加困难。

考虑一种利用缩进和一致关键字大小写的替代方法（即小写与大写）：

SELECT
    users.first_name || " " || users.last_name,
    users.email,
    organizations.name,
    organizations.vertical,
    jobs.name,
    jobs.id,
    (CASE
         WHEN jobs.status = 'Closed' THEN jobs.updated_at - jobs.created_at
         ELSE 'Not Closed'
     END) AS days_to_hire, 
    (CASE
         WHEN jobs.status IN ('Open', 'Pending') THEN CURRENT_TIMESTAMP - jobs.created_at
         ELSE 'Closed_or_Deleted'
     END) AS days_open,
FROM organizations
JOIN users ON organizations.id = users.organization_id
JOIN jobs ON user.id= jobs.user.id

更容易阅读和调试我认为你会同意。

我个人并不关心CASE语句周围的括号，但与良好，一致地使用缩进和关键词大小相比，这是一个次要的选择。