Merge pull request #24 from ctc-uci/6-create-class-enrollments-and-cl…

…asses-taught-tables

added class_enrolled and class_taught sql schema

server/db/schema/class_enrollments.sql

@@ -0,0 +1,19 @@
+CREATE TABLE IF NOT EXISTS class_enrollments (
+    id SERIAL,
+    student_id INTEGER NOT NULL,
+    class_id INTEGER NOT NULL,
+    attendance DATE NOT NULL,
+
+    CONSTRAINT Pk_class_enrollments
+        PRIMARY KEY(student_id, class_id, id),
+
+    CONSTRAINT fk_student
+        FOREIGN KEY(student_id)
+        REFERENCES student(id)
+        ON DELETE CASCADE,
+
+    CONSTRAINT fk_class
+        FOREIGN KEY(class_id)
+        REFERENCES classes(id)
+        ON DELETE CASCADE
+)

server/db/schema/classes_taught.sql

@@ -0,0 +1,17 @@
+CREATE TABLE IF NOT EXISTS classes_taught (
+    class_id INTEGER NOT NULL,
+    teacher_id INTEGER NOT NULL,
+
+    CONSTRAINT Pk_classes_taught
+        PRIMARY KEY(class_id, teacher_id),
+
+    CONSTRAINT fk_class
+        FOREIGN KEY(class_id)
+        REFERENCES classes(id)
+        ON DELETE CASCADE,
+
+    CONSTRAINT fk_teacher
+        FOREIGN KEY(teacher_id)
+        REFERENCES teacher(id)
+        ON DELETE CASCADE
+)