LAG SQL 操作在 Amazon Redshift 中不起作用

Question

我不断收到错误：

语法错误：在“，”或附近行：4 位置：3

尝试为来自 Amazon Redshift 的会话创建跟踪时在 Periscope 上。当我尝试仅查询 id、时间戳和 LAG 操作时，LAG 操作似乎会引发错误。

    SELECT 
      id 
      , timestamp
      , SUM(is_new_session) OVER (ORDER BY id, timestamp) AS global_session_id
      , SUM(is_new_session) OVER (PARTITION BY id ORDER BY timestamp) AS user_session_id
     FROM (SELECT -- creates session
            id
            , timestamp 
            , CASE 
               WHEN EXTRACT('EPOCH' FROM timestamp) - EXTRACT('EPOCH' 
                 FROM last_event) >= (60 * 10) OR last_event IS NULL THEN 1 
               ELSE 0 
               END AS is_new_session
           FROM (SELECT                      
                  id 
                  , timestamp
                  , LAG(timestamp,1) OVER (PARTITION BY id ORDER BY timestamp) AS last_event
                 FROM ios.tracks) last
           ) final

Answer 1

timestamp 是保留字。可能需要始终将其指定为 "timestamp" 或为该列使用不同的名称。

https://docs.aws.amazon.com/redshift/latest/dg/r_pg_keywords.html