feat: update structure

2024-01-22 14:27:40 +08:00
parent 7836c9185c
commit 3544a28a2e
559 changed files with 120846 additions and 4102 deletions
--- a/cs2102/labs/project/part3.sql
+++ b/cs2102/labs/project/part3.sql
@@ -0,0 +1,100 @@
+CREATE OR REPLACE PROCEDURE create_practice_quiz(
+    quiz_name VARCHAR,
+    creator_id VARCHAR,
+    num_questions INT,
+) AS
+$$
+DECLARE
+    quiz_id INT;
+    c CURSOR FOR (SELECT * FROM quiz_questions);
+    quiz_qn RECORD;
+    random_no INT;
+    num_qns INT = (SELECT COUNT(*) FROM questions);
+BEGIN
+    INSERT INTO quizzes (id, name, published, total_points, avail_from, avail_to, time_limit, mandatory, status,
+                         creator)
+    values ((SELECT id + 1 FROM quizzes ORDER BY id DESC LIMIT 1), -- get last id
+            quiz_name,
+            true,
+            0,
+            NOW(),
+            NULL,
+            NULL,
+            FALSE,
+            'public',
+            creator_id)
+    RETURNING id
+        INTO quiz_id;
+    OPEN c;
+    FOR val IN 1..num_questions LOOP
+        random_no = FLOOR(random() * (num_questions));
+    END LOOP;
+    CLOSE c;
+END;
+$$
+    LANGUAGE plpgsql;
+
+CREATE OR REPLACE PROCEDURE create_practice_quiz (
+    quiz_name varchar,
+    creator_id varchar,
+    num_questions int
+)
+LANGUAGE plpgsql
+AS $$
+BEGIN
+    WITH quiz AS (
+        INSERT INTO quizzes (
+             id,
+             name,
+             published,
+             num_attempts,
+             avail_from,
+             total_points,
+             mandatory,
+             status,
+             creator
+        )
+        VALUES (
+            (SELECT count(*) + 1 FROM quizzes),
+            quiz_name,
+            true,
+            0,
+            now(),
+            0,
+            false,
+            'public',
+            creator_id
+        )
+        RETURNING
+            id,
+            status,
+            creator
+    )
+    INSERT INTO quiz_questions (
+        quiz_id,
+        question_id,
+        points,
+        mandatory,
+        position
+    )
+    SELECT
+        q.id,
+        qn.id,
+        0,
+        false,
+        ROW_NUMBER() OVER (ORDER BY random())
+    FROM
+        questions qn,
+        quiz q
+    WHERE
+        qn.valid = true
+        AND (
+            qn.status = 'public'
+            OR qn.creator = q.creator
+        )
+    ORDER BY random()
+    LIMIT num_questions;
+END
+$$;
+
+SELECT FLOOR(random() * (SELECT COUNT(*) FROM questions));