multiple columns in one row sql code example

Example 1: add multiple columns to table sql

//Example
ALTER TABLE employees
  ADD last_name VARCHAR(50),
      first_name VARCHAR(40);

Example 2: add multiple row table pl sql

INSERT INTO real_table_name (person_id, given_name, family_name, title) 
  WITH temp_table AS ( 
    SELECT 4, 'Ruth',     'Fox',      'Mrs'    FROM dual UNION ALL 
    SELECT 5, 'Isabelle', 'Squirrel', 'Miss'   FROM dual UNION ALL 
    SELECT 6, 'Justin',   'Frog',     'Master' FROM dual UNION ALL 
    SELECT 7, 'Lisa',     'Owl',      'Dr'     FROM dual 
  ) 
  SELECT * FROM temp_table