change mysql code example

Example 1: 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 2: my sql alter table

ALTER TABLE nom_table
MODIFY nom_colonne type_donnees

Example 3: my sql alter table

ALTER TABLE nom_table
DROP nom_colonne

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