PostgreSQL 的子查询返回 select 附近的语法错误

Question

I am a beginner to database, and I am trying to run a subquery to insert data from one table to another one with identical schema.

insert into tbl_technologies_used (t_name_tech, t_category_tech, i_rating) 
  values (
    select t_name_tech, t_category_tech, i_rating 
    from tbl_technologies_proposed
  );

But I got this error:

ERROR:  syntax error at or near "select"
LINE 1: ... (t_name_tech, t_category_tech, i_rating) values (select t_n...

How can I fix this issue? I have checked my code again and again, but I can't find out the error.

Answer 1

If the source of an INSERT is a SELECT, you can't use VALUES :

insert into tbl_technologies_used (t_name_tech, t_category_tech, i_rating) 
select t_name_tech, t_category_tech, i_rating 
from tbl_technologies_proposed

The values clause provides a static set of rows which is not needed as the rows to be inserted come from your SELECT statement.