alter table query sql server change column code example

Example 1: sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

Example 2: alter table query sql server change column

ALTER TABLE table_name
  ALTER COLUMN column_name column_type;

Example 3: alter table query sql server change column

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

Example 4: alter table query sql server change column

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

Example 5: alter table query sql server change column

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

Example 6: alter table query sql server change column

ALTER TABLE table_name
  DROP COLUMN column_name;