how to create new column in mysql with sql code example

Example 1: add column in mysq

ALTER TABLE Table_name ADD name_column INT(255);

Example 2: mysql add columns

ALTER TABLE table
ADD [COLUMN] column_name_1 column_1_definition [FIRST|AFTER existing_column],
ADD [COLUMN] column_name_2 column_2_definition [FIRST|AFTER existing_column],
...
;