错误消息：字段列表中的字段列表中的未知列

Question

当前我有以下代码，第I部分和第II部分工作正常。 但是，当我尝试联盟，两个临时表，它让我给我错误消息 “未知的列'名称'在'字段列表'”，即使我已经尝试了很多时间来更改名称在临时表中提交'姓名'。

CREATE TEMPORARY TABLE IF NOT EXISTS inp_cnt AS(
SELECT a.name, count(DISTINCT ad.pub_id) AS c 
FROM author AS a 
INNER JOIN authored AS ad ON a.id = ad.author_id 
INNER JOIN inproceedings AS inp ON ad.pub_id = inp.pub_id 
WHERE inp.booktitle = "SIGMOD conference" OR inp.booktitle = "KDD" OR inp.booktitle = "VLDB" 
GROUP BY ad.author_id); 

CREATE TEMPORARY TABLE IF NOT EXISTS ar_cnt AS(
SELECT a.name, count(DISTINCT ad.pub_id) AS c 
FROM author AS a 
INNER JOIN authored AS ad ON a.id = ad.author_id 
INNER JOIN article AS ar ON ad.pub_id = ar.pub_id 
WHERE ar.journal = "PVLDB" 
GROUP BY ad.author_id); 


SELECT name,sum(c) AS total 
FROM (
SELECT name,c FROM inp_cnt 
UNION ALL 
SELECT name, c FROM ar_cnt 
) as tmp 
GROUP BY name 
ORDER BY total DESC 
LIMIT 20; 

有人可以提供一些提示吗？我得到这个错误味精，因为名称是一个特殊的关键字在SQL？

Answer 1

尝试将最后查询：

SELECT tmp.name 
     ,SUM(tmp.c) AS total 
FROM (SELECT name 
        ,c 
      FROM  inp_cnt 
      UNION ALL 
      SELECT name 
        ,c 
      FROM  ar_cnt 
     ) AS tmp 
GROUP BY tmp.name 
ORDER BY total DESC 
LIMIT 20; 

所以你在Group By有tmp.name。