sql modify column code example

Example 1: alter table modify column

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

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

Example 2: alter table query sql server change column

ALTER TABLE employees
  ALTER COLUMN last_name VARCHAR(75) NOT NULL;

Example 3: sql alter column

Changes the data type of a table’s column.
Example: In the ‘users’ table, make the column ‘incept_date’ into a
‘datetime’ type.
ALTER TABLE users
ALTER COLUMN incept_date datetime;

Example 4: alter table query sql server change column

ALTER TABLE table_name
  DROP COLUMN column_name;

Example 5: alter table query sql server change column

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