这是我的表web_book的方案:
Column | Type | Modifiers ----------------+------------------------+------------------------------------------------------- id | integer | not null default nextval('web_book_id_seq'::regclass) page_count | integer | not null year_published | integer | not null file | character varying(100) | not null image | character varying(100) | not null display_on_hp | boolean | not null name | character varying(128) | not null description | text | not null name_cs | character varying(128) | name_en | character varying(128) | description_cs | text | description_en | text |
该表包含id = 3的一行。我想复制行,但如果我尝试这样:
INSERT INTO web_book SELECT * FROM web_book WHERE id=3;
我得到这个:
ERROR: duplicate key value violates unique constraint "web_book_pkey" DETAIL: Key (id)=(3) already exists
您需要为新插入的行创建一个新的ID:
原文链接:https://www.f2er.com/postgresql/192886.htmlINSERT INTO web_book( id,page_count,year_published,file,image,display_on_hp,name,description,name_cs,name_en,description_cs,description_en ) SELECT nextval('web_book_id_seq'),description_en FROM web_book WHERE id=3;
如ClodoaldoNeto所提到的,您可以通过简单地省略ID列,让默认定义做到这一点,使事情变得更简单:
INSERT INTO web_book( page_count,description_en ) SELECT page_count,description_en FROM web_book WHERE id=3;
在这种情况下,您不需要知道序列名称(但是这不清楚)。