alter column type in mysql code example

Example 1: alter table column change data type to text mysql

ALTER TABLE tablename MODIFY columnname INTEGER;

Example 2: alter table add column

ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;

Example 3: 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;

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