如何從其他表插入表格

Question

我有兩個表格，art和art_tag_art。 這是列藝術表：

id 
title 
slug 
image 

這個數值藝術表

這列art_tag_art

id 
art_id 
tag_id 

值art_tag_art

我想複製所有的藝術。 id到art_tag_art.art_id並同時複製所有內容新行中的art_tag_art.tag_id（已存在）。

我曾嘗試和搜索幾個MySQL的句法插入和選擇：

select id into @aid from art; 
select tag_id into @tid from art_tag_art; 
insert into art_tag_art (art_id, tag_id) values (@aid,@tid); 


INSERT INTO art_tag_art (art_id, tag_id) 
SELECT art.id, art_tag_art.tag_id 
FROM art, art_tag_art order by id; 

但沒有任何工程。這一次，我得到一個錯誤信息：Error Code: 1364. Field 'id' doesn't have a default value

期望值：

Answer 1

試試這個：

select id=@aid from art order by id; select tag_id=@tid from art_tag_art; insert into art_tag_art (art_id, tag_id) values (@aid,@tid);
INSERT INTO art_tag_art (art_id, tag_id) SELECT art.id, art_tag_art.tag_id FROM art, art_tag_art order by id;

Answer 2

你能做到這一點，但它不舉目皆是明智的

insert into art_tag_art(art_id,tag_id) 
select a.id ,(select at.tag_id from art_tag_art at where at.id = a.id - 25) 
from art a;