PostgreSQL: insert from another table

Question

I\'m trying to insert data to a table from another table and the tables have only one column in common. The problem is, that the TABLE1 has columns that won\'t accept null value

Answer 1

Very late answer, but I think my answer is more straight forward for specific use cases where users want to simply insert (copy) data from table A into table B:

INSERT INTO table_b (col1, col2, col3, col4, col5, col6)
SELECT col1, 'str_val', int_val, col4, col5, col6
FROM table_a