how to add in sql code example

Example 1: sql insert query

--sql insert quest example
INSERT INTO table_name (column1, column2, column3, ...)
VALUES (value1, value2, value3, ...);

Example 2: add multiple columns to table sql

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

Example 3: sql add

Adds a new column to an existing table.
Example: Adds a new column named ‘email_address’ to a table named
‘users’.
ALTER TABLE users
ADD email_address varchar(255);

Example 4: add multiple columns to table sql

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