Creating a new table from another make it read-only in PGadmin interface

Question

On PostgreSQL 11, I've created a new table from another, using a subquery :

CREATE TABLE table2 AS (SELECT * FROM table1)

As a result, table2 is created, but each column is in read-only mode within the PGadmin interface.

--EDIT--

To answer to Vérace's comment, i add screenshots of my tables (I use PGadmin). As you can see, Table2's columns have a locker in their name. I can update a value with an SQL Query, but not with PGadmin interface. So, it's a PGadmin problem... !

TABLE 1

TABLE 2

Answer 1

When you create a table by using following query

CREATE TABLE table2 AS (SELECT * FROM table1)

table2 is created but the sequences and constraints are not copied from table1. Due to this reason columns became read only mode. You can insert the data inside the read only columns by an insert statement, but not by UI of PgAdmin4. By creating constraints, mainly primary key, you can change read only mode to editable columns and then you can edit the columns by UI of PgAdmin4.