mysql add columns
snippet in sql

add column in mysq

user4715

ALTER TABLE Table_name ADD name_column INT(255);

mysql add column

user1223

ALTER TABLE table_name
ADD [COLUMN] column_name column_definition [FIRST|AFTER existing_column];

mysql add columns

user2409

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],
...
;