In order to drop a column to a table in PostgreSQL, we type the following:

ALTER TABLE myTable
    DROP COLUMN columnName;

If you want to drop a table column and its dependents, we type the following:

ALTER TABLE myTable
    DROP COLUMN columnName CASCADE;

If you want to drop a table column if it exists, we type the following:

ALTER TABLE myTable
    DROP COLUMN IF EXISTS columnName;

If you want to drop multiple columns in a table, we type the following:

ALTER TABLE myTable
    DROP COLUMN columnName1,
    DROP COLUMN columnName2;