将您的插入内容更改为如下所示:

Change your insert to look like the following :

insert into sample_elements (name,position,ownerel) select 'Namespace1',id,0 from sample_elements where name='Namespace1';

基本上不使用值，而仅使用select语句并将经过编码的值作为列插入

Basically instead of using values only use the select statement and insert the harcoded values as columns