Check out example codes for "add multiple columns to table sql". It will help you in understanding the concepts better.

Code Example 1

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

Code Example 2

ALTER TABLE table_name
  ADD column_1 column_definition,
      column_2 column_definition,
      ...
      column_n column_definition;

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