檢索通過SQL

Question

重複的記錄我有一個像

paper Id Author Id 

1   15 
2   13 
3   12 
3   11 
4   10 
4   10 
4   9 

我要選擇具有多個文件數據authors.So我的數據應該看起來像

paper Id Author Id 
3   12 
3   11 
4   10 
4    9 

我試着用SQL查詢：

statement<-"SELECT PaperId,AuthorId,COUNT(PaperId) 
      FROM author_data_pap_aut 
      GROUP BY PaperId,AuthorId 
      HAVING (COUNT(*) >1)" 

但它不工作。我如何得到預期的結果

感謝

Answer 1

SELECT PaperId 
FROM author_data_pap_aut 
GROUP BY PaperId 
HAVING COUNT(distinct AuthorId) > 1 

如果你需要作者太然後使用

select distinct PaperId, AuthorId 
from author_data_pap_aut 
where PaperId in 
(
    SELECT PaperId 
    FROM author_data_pap_aut 
    GROUP BY PaperId 
    HAVING COUNT(distinct AuthorId) > 1 
) 

Answer 2

您需要使用group_concat()功能做你的過程