我有两张桌子:
诗:
---------------------------------------------------
| id | poem | author |
---------------------------------------------------
| 1 | Blah blah Hey | Jane Doe |
---------------------------------------------------
| 1 | Yo yo Hey Bla | Jane Doe |
---------------------------------------------------
作者:
-----------------------------
| id | name |
-----------------------------
| 0 | |
-----------------------------
我想从诗歌表中删除重复项并填充新创建的authors表。理想情况下,我想在author表中使用author.id更新作者(或创建一个新的authors_id)列
我知道以下代码显示我的重复项
SELECT author, COUNT(*)
FROM poem
GROUP BY author
HAVING
COUNT(*) > 1
但是如何将它们添加到author.names列?
此外,这段代码会帮助我完成下一部分吗?
ALTER TABLE poem
ADD COLUMN author_id serial,
ADD CONSTRAINT author_id FOREIGN KEY (id) REFERENCES author (id) MATCH FULL;
有什么想法吗?
答案 0 :(得分:0)
尝试从select语句插入。例如:
insert into Authors (id, author)
select distinct id, author
from Poems