alter table modify code example

Example 1: mysql alter table add column

ALTER TABLE vendors ADD COLUMN phone VARCHAR(15) AFTER name;

Example 2: sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

-- Example
ALTER TABLE product
ALTER COLUMN description VARCHAR(250);

Example 3: alter table modify column

-- ORACLE 18c
ALTER TABLE table_name 
MODIFY column_name datatype;

-- Example
ALTER TABLE product
MODIFY description VARCHAR2(500 char);

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