Check out example codes for "mysql add column". It will help you in understanding the concepts better.

Code Example 1

ALTER TABLE `TABLE_NAME` 
	ADD `COLUMN_NAME` VARCHAR(50) NULL
    AFTER `COLUMN_NAME_AFTER`;

Code Example 2

ALTER TABLE Table_name ADD name_column INT(255);

Code Example 3

alter table icecream add column flavor varchar (20) ;

Code Example 4

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

Code Example 5

ALTER TABLE Table_name
ADD Email varchar(255);

Code Example 6

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

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