Question

我正在使用Union All进行查询，我想确保将重复的行添加到结果查询中。使用“全部联盟”时，不会正确添加重复的行。当谷歌搜索“sql union with duplicates”时，它声明：“联盟将删除重复项.Union All不会。您在查询的第一部分中没有重复项（可能由左连接生成）。据我了解UNION，它不会添加到已经存在的结果集行，但它不会删除第一个数据集中已存在的重复项。“在我的例子中，我想要添加已经存在的结果集行。我该怎么做？

这是我的问题：

SELECT player_name_fkey, school_name_fkey, score_simple, sum(score_simple) over (partition by player_name_fkey) as sum_scores

FROM (

    SELECT player_name_fkey, school_name_fkey, SUM(score) as score_simple 

        FROM simple LEFT JOIN players on players.name=simple.player_name_fkey 

        WHERE category='Cadet' AND gender='Féminin' GROUP BY player_name_fkey, school_name_fkey

    UNION ALL

        SELECT player_name_fkey, school_name_fkey, SUM(score) as score_simple

        FROM double LEFT JOIN players on players.name=double.player_name_fkey 

        WHERE category='Cadet' AND gender='Féminin' GROUP BY player_name_fkey, school_name_fkey) t1

GROUP BY player_name_fkey, school_name_fkey, score_simple

提前感谢您的帮助！

Answer 1

如Felix Pamittan所述，最后删除GROUP BY条款解决了我的问题。

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SQL - 使用Union All并添加重复项

1 个答案: