Postgres - CREATE TABLE FROM SELECT

Question

I have two tables, one contains a large list of IDs and Info regarding those ids.

I have a second table Graph which just has two columns, each column contains the aforementioned id numbers, multiple times. I want to trim the size of my Info table by selecting only those ids that appear in my graph and creating a new smaller Info table. Is there a simple way of doing this?

CREATE TABLE FROM SELECT?  

Thanks!

Answer 1

It's as easy as:

create table new_table as  select t1.col1, t2.col2 from some_table t1    join t2 on t1.id = t2.some_id; 

You can use any select statement for that. The column names of the new table are defined by the column aliases used in th query.

More details in the manual: http://www.postgresql.org/docs/current/static/sql-createtableas.html