sql edit column code example

Example 1: sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

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

Example 2: alter table modify column

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

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

Example 3: alter table query sql server change column

sp_rename 'table_name.old_column_name', 'new_column_name', 'COLUMN';

Example 4: alter table query sql server change column

sp_rename 'employees.last_name', 'lname', 'COLUMN';