add coulumn in mysql code example

Example 1: alter table add column

ALTER TABLE table_name 
ADD column_name datatype;

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],
...
;