CREATE TABLE "Scores"
(
"id_score" GUID COLLATE "UNI" DEFAULT CURRENT_GUID,
"month" INT NOT NULL,
"score" DECIMAL(19,2) NOT NULL,
CONSTRAINT "pk_id_score" PRIMARY KEY ("id_score")
)!

INSERT INTO Scores (month, score) VALUES (1, 69.13)!
INSERT INTO Scores (month, score) VALUES (2, 90.22)!
INSERT INTO Scores (month, score) VALUES (3, 25.31)!
INSERT INTO Scores (month, score) VALUES (4, 50.40)!
INSERT INTO Scores (month, score) VALUES (5, 73.59)!
INSERT INTO Scores (month, score) VALUES (6, 88.68)!
INSERT INTO Scores (month, score) VALUES (7, 36.77)!
INSERT INTO Scores (month, score) VALUES (8, 61.86)!
INSERT INTO Scores (month, score) VALUES (9, 90.95)!
INSERT INTO Scores (month, score) VALUES (10, 79.13)!
INSERT INTO Scores (month, score) VALUES (11, 37.13)!
INSERT INTO Scores (month, score) VALUES (12, 18.12)!

SELECT AVG(score), STDDEV(score) FROM Scores