Adds MCQs.

database/mcqs/03-normalisation-acid.md

@@ -0,0 +1,32 @@
+# Questions
+1. Joe Bloggs is creating a social media today. However, Joe has kept user and group information in the same table. Now whenever Joe removes a user, the group information is also gone. Which type of anomaly is this?
+    >A. Insertion \
+    B. Updation \
+    C. Deletion
+---
+2. A user has an ID, name, email and group ID. One user can only have one email and it is unique.
+Which of the following dependencies is not correct?
+
+    >A. ID -> NAME \
+    B. EMAIL -> NAME \
+    C. EMAIL -> GROUP ID \
+    D. NAME -> GROUP ID
+---
+3. Joe has created a table for group members where the columns are `Group ID, User ID, Rating, Group Name`. The primary key here is `Group ID, User ID`.
+Which type of functional dependency exists?
+    >A. No functional dependency \
+    B. Transitive \
+    C. Partial
+---
+4. Joe has identified that one of his tables does not satisfy 1NF constraints. Which of the following types of ERD attributes are allowed under 1NF?
+    >A. Composite \
+    B. Multivalued \
+    C. Derived \
+    D. Index
+
+---
+# Answers
+1. A. `Deletion`
+2. D `NAME -> GROUP ID`
+3. C `Partial`
+4. C `Derived`