This will change the name of column:
ALTER TABLE table_name CHANGE old_colm_name new_colm_name
This will change the data type of a column:
ALTER TABLE table_name CHANGE colm_name same_colm_name [new data type]
This will change the name of column:
ALTER TABLE table_name CHANGE old_colm_name new_colm_name
This will change the data type of a column:
ALTER TABLE table_name CHANGE colm_name same_colm_name [new data type]