alter command in mysql code example

Example 1: add column in mysq

ALTER TABLE Table_name
ADD Email varchar(255);

Example 2: add new column to the table mysql

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

Example 3: mysql alter table add column

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

Example 4: change data type in mysql

ALTER TABLE table_name

CHANGE COLUMN column_name column_name datatype;

Example 5: alter table mysql

ALTER TABLE contacts
  ADD last_name varchar(40) NOT NULL
    AFTER contact_id,
  ADD first_name varchar(35) NULL
    AFTER last_name;

Example 6: my sql alter table

ALTER TABLE nom_table
DROP nom_colonne