Answers for "alter table edit column"

sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

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

alter table query sql server change column

ALTER TABLE table_name
  ALTER COLUMN column_name column_type;

alter table query sql server change column

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

alter table query sql server change column

ALTER TABLE table_name
  DROP COLUMN column_name;

alter table query sql server change column

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