alter table syntax 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: change data type in mysql

ALTER TABLE table_name

CHANGE COLUMN column_name column_name datatype;

Example 3: mysql alter table add column

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

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