3
ALTER TABLE semester RENAME COLUMN semester TO url_name;
4
ALTER TABLE semester ADD COLUMN display_name TEXT;
5
ALTER TABLE semester ADD COLUMN code TEXT;
7
UPDATE semester SET code = UPPER(url_name);
8
UPDATE semester SET display_name = 'semester ' || code;
10
ALTER TABLE semester ALTER COLUMN display_name SET NOT NULL;
11
ALTER TABLE semester ALTER COLUMN code SET NOT NULL;