1ALTER TABLE `TABLE_NAME`
2 ADD `COLUMN_NAME` VARCHAR(50) NULL
3 AFTER `COLUMN_NAME_AFTER`;
1ALTER TABLE table_name
2ADD [COLUMN] column_name column_definition [FIRST|AFTER existing_column];
1ALTER TABLE table
2 ADD [COLUMN] column_name column_definition
3 [FIRST|AFTER existing_column];
1ALTER TABLE contacts
2 ADD last_name varchar(40) NOT NULL
3 AFTER contact_id,
4 ADD first_name varchar(35) NULL
5 AFTER last_name;