Try to add price for each vets in the database

src/main/resources/db/hsqldb/data.sql

-INSERT INTO vets VALUES (1, 'James', 'Carter');
-INSERT INTO vets VALUES (2, 'Helen', 'Leary');
-INSERT INTO vets VALUES (3, 'Linda', 'Douglas');
-INSERT INTO vets VALUES (4, 'Rafael', 'Ortega');
-INSERT INTO vets VALUES (5, 'Henry', 'Stevens');
-INSERT INTO vets VALUES (6, 'Sharon', 'Jenkins');
+INSERT INTO vets VALUES (1, 'James', 'Carter', NULL);
+INSERT INTO vets VALUES (2, 'Helen', 'Leary', NULL);
+INSERT INTO vets VALUES (3, 'Linda', 'Douglas', NULL);
+INSERT INTO vets VALUES (4, 'Rafael', 'Ortega', NULL);
+INSERT INTO vets VALUES (5, 'Henry', 'Stevens', NULL);
+INSERT INTO vets VALUES (6, 'Sharon', 'Jenkins', NULL);
 
 INSERT INTO specialties VALUES (1, 'radiology');
 INSERT INTO specialties VALUES (2, 'surgery');