postgres copy table from one database to another code example
Example 1: postgres copy table from one schema to another
create table schema2.the_table (like schema1.the_table including all);
insert into schema2.the_table
select *
from schema1.the_table;
Example 2: copy from one table to another postgres using matching column
UPDATE Table2 --format schema.table_name
SET
ref_id2 = table1.ref_id1
FROM table1 -- mention schema name
WHERE table1.id = table2.id
AND
table1.a_ref1 = table2.b_ref1;