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我收到以下错误

执行查询时出现“ORA-00923：未在预期位置找到 FROM 关键字” 

SELECT 
    count(pf.pref_selection) filter ( WHERE pc.collection = "players")      OVER (partition BY pc.collection,pc.user_id )  AS Avg_players        
    count(pf.pref_selection) filter ( WHERE pc.collection = "teams")        OVER (partition BY pc.collection,pc.user_id )  AS Avg_teams  
FROM NBA_OWNER.PREFERENCES pf 
inner join NBA_OWNER.PREF_COLLECTIONS pc on pc.ID=pf.COLLECTION_ID 
where pc.LAST_UPDATE_DATE>"30-SEP-16'`
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1 回答 1

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你有几个错误。正如@cricket_007 指出的那样，您在两个计数表达式之间缺少逗号。但是您的filter子句也有无效的语法-至少在Oracle中不存在；您在字符串文字周围使用了双引号而不是单引号；日期字符串周围的引号更奇怪；并且您依赖于日期格式的 NLS 设置。

如果我了解您的尝试，这更接近您的需要：

SELECT 
    count(case when pc.collection = 'players' then pf.pref_selection end)
      OVER (partition BY pc.user_id) AS Avg_players, 
    count(case when pc.collection = 'teams' then pf.pref_selection end)
      OVER (partition BY pc.user_id) AS Avg_teams  
FROM NBA_OWNER.PREFERENCES pf 
inner join NBA_OWNER.PREF_COLLECTIONS pc on pc.ID=pf.COLLECTION_ID 
where pc.LAST_UPDATE_DATE > date '2016-09-30'

虽然输出可能不是很有用。对于每个用户 ID，您可能会获得多行，每行都显示总计数（您avg出于某种原因调用过）。您可能只想查看每个 ID 的计数一次，并查看它们与哪个 ID 相关，所以我认为您需要聚合而不是分析计数：

SELECT 
    pc.user_id,
    count(case when pc.collection = 'players' then pf.pref_selection end)
      AS Avg_players,      
    count(case when pc.collection = 'teams' then pf.pref_selection end)
      AS Avg_teams  
FROM NBA_OWNER.PREFERENCES pf 
inner join NBA_OWNER.PREF_COLLECTIONS pc on pc.ID=pf.COLLECTION_ID 
where pc.LAST_UPDATE_DATE > date '2016-09-30'
group by pc.user_id
于 2017-02-07T22:53:41.537 回答