alter table change datatype in mysql code example

Example 1: add column in mysq

ALTER TABLE Table_name
ADD Email varchar(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],
...
;