删除与sql查询关联的所有行

Question

我有一个包含5列的表（primary_key，abstractid，sentid，wordid，term）。

此查询会提取一系列不同的术语，这些术语出现在少于6个不同的abstractid中。

SELECT 
    term, COUNT(distinct abstractid) AS "num" 
FROM 
    nsfabstracts 
HAVING 
   COUNT(distinct abstractid) < 6 
GROUP BY 
   term 
ORDER BY 
   "num" DESC;

如何修改上述查询以计算它返回的行数？另外，如何删除与上述查询相关联的所有行？

Answer 1

懒惰，使用子选择：

SELECT count(*) FROM (
     SELECT term, COUNT(distinct abstractid) AS "num" FROM nsfabstracts HAVING COUNT(distinct abstractid) < 6 GROUP BY term
)

和

DELETE FROM nsfabstracts WHERE term in (
     SELECT term, COUNT(distinct abstractid) AS "num" FROM nsfabstracts HAVING COUNT(distinct abstractid) < 6 GROUP BY term
)