Question

我收到以下错误

执行查询时
“ORA-00923：找不到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'`

Answer 1

您有几个错误。正如@ cricket_007指出的那样，你在两个计数表达式之间缺少一个逗号。但是你的filter子句的语法也是无效的 - 至少在Oracle中它是不存在的;你在字符串文字周围使用双引号而不是单引号;日期字符串周围的引号甚至更奇怪;并且您依赖于日期格式的NLS设置。

如果我理解你的尝试，那么这更接近你的需要：

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'

但输出可能不是很有用。对于每个用户ID，您可以获得多行，每行显示总计数（由于某种原因，您称之为avg）。您可能只希望查看每个ID的计数一次，并查看它们与哪个ID相关，因此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

“ORA-00923：未找到FROM关键字”

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