initial commit

lab5_schema.sql

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+-- 1. Create a schema for this lab (only runs once)
+CREATE SCHEMA IF NOT EXISTS lab5;
+
+-- 2. Tell PostgreSQL to use this schema by default
+SET search_path TO lab5;
+
+-- 3. Safety header: drop old tables if they exist
+DROP TABLE IF EXISTS location CASCADE;
+DROP TABLE IF EXISTS department CASCADE;
+DROP TABLE IF EXISTS professor CASCADE;
+DROP TABLE IF EXISTS student CASCADE;
+DROP TABLE IF EXISTS term CASCADE;
+DROP TABLE IF EXISTS course CASCADE;
+DROP TABLE IF EXISTS course_offering CASCADE;
+DROP TABLE IF EXISTS enrollment CASCADE;
+
+-- 4. Create tables for lab5
+CREATE TABLE location (
+    loc_building VARCHAR(10) NOT NULL,
+    loc_room     VARCHAR(10) NOT NULL,
+    loc_code     VARCHAR(20) GENERATED ALWAYS AS (
+                    loc_building || ' ' || loc_room
+                 ) STORED PRIMARY KEY
+);
+
+CREATE TABLE department (
+    dep_code    VARCHAR(10) PRIMARY KEY,
+    dep_name    VARCHAR(50) NOT NULL,
+    dep_school  VARCHAR(50) NOT NULL,
+    dep_phone   VARCHAR(12) NOT NULL,
+    dep_email   VARCHAR(50) NOT NULL,
+    dep_website VARCHAR(50) NOT NULL,
+    loc_code    VARCHAR(10) REFERENCES location(loc_code)
+);
+
+CREATE TABLE professor (
+    prof_num    VARCHAR(20) PRIMARY KEY,
+    prof_fname  VARCHAR(20) NOT NULL,
+    prof_lname  VARCHAR(20) NOT NULL,
+    prof_email  VARCHAR(50) NOT NULL,
+    prof_phone  VARCHAR(12) NOT NULL,
+    prof_hired  DATE        NOT NULL,
+    prof_office VARCHAR(20) REFERENCES location(loc_code) NOT NULL,
+    dep_code    VARCHAR(50) REFERENCES department(dep_code) NOT NULL
+);
+
+CREATE TABLE term (
+    term_year       INTEGER     NOT NULL,
+    term_semester   VARCHAR(10) NOT NULL,
+    term_name       VARCHAR(30) GENERATED ALWAYS AS (
+                        term_semester || ' ' || (term_year::text)
+                    ) STORED,
+
+    term_code       VARCHAR(6)  GENERATED ALWAYS AS (
+        (term_year::text) ||
+        CASE term_semester
+            WHEN 'Winter' THEN '10'
+            WHEN 'Spring' THEN '30'
+            WHEN 'Summer' THEN '40'
+            WHEN 'Fall'   THEN '50'
+        END
+    ) STORED,
+
+    CONSTRAINT term_pk PRIMARY KEY (term_code),
+    CONSTRAINT term_semester_ck CHECK (term_semester IN ('Winter','Spring','Summer','Fall'))
+);
+
+CREATE TABLE student (
+    stu_num     VARCHAR(20)  PRIMARY KEY,
+    stu_fname   VARCHAR(20)  NOT NULL,
+    stu_lname   VARCHAR(20)  NOT NULL,
+    stu_email   VARCHAR(50)  NOT NULL,
+    stu_phone   VARCHAR(12)  NOT NULL,
+    stu_program VARCHAR(5)   NOT NULL,
+    stu_term    VARCHAR(6)   REFERENCES term(term_code) NOT NULL,
+    stu_dept    VARCHAR(10)  REFERENCES department(dep_code) NOT NULL
+);
+
+CREATE TABLE course (
+    crs_subject VARCHAR(10)  REFERENCES department(dep_code) NOT NULL,
+    crs_num     INTEGER      NOT NULL,
+    crs_title   VARCHAR(50)  NOT NULL,
+    crd_credits NUMERIC(3,1) NOT NULL,
+    dep_code    VARCHAR(10)  REFERENCES department(dep_code) NOT NULL,
+    crs_desc    TEXT         NOT NULL,
+
+    crs_code    VARCHAR(60)  GENERATED ALWAYS AS (
+                                dep_code || ' ' || crs_num::text
+                             ) STORED PRIMARY KEY
+);
+
+CREATE TABLE course_offering (
+    off_id         SERIAL       PRIMARY KEY,
+    off_crs_code   VARCHAR(60)  REFERENCES course(crs_code) NOT NULL,
+    off_term_code  VARCHAR(6)   REFERENCES term(term_code) NOT NULL,
+    off_section    VARCHAR(50)  NOT NULL,
+    off_type       VARCHAR(10)  NOT NULL,
+    off_prof       VARCHAR(20)  REFERENCES professor(prof_num) NOT NULL,
+    off_days       VARCHAR(100) NOT NULL,
+    off_start_time TIME         NOT NULL,
+    off_end_time   TIME         NOT NULL,
+    off_loc        VARCHAR(20)  REFERENCES location(loc_code) NOT NULL,
+    off_capacity   INTEGER      NOT NULL,
+
+    CONSTRAINT off_type_ck CHECK (off_type IN ('Lecture','Lab'))
+);
+
+CREATE TABLE enrollment (
+    stu_num         VARCHAR(20) REFERENCES student(stu_num) NOT NULL,
+    off_id          INTEGER     REFERENCES course_offering(off_id) NOT NULL,
+    enr_status      VARCHAR(8)  NOT NULL,
+    enr_final_grade VARCHAR(2),
+
+    CONSTRAINT enr_pk PRIMARY KEY (stu_num, off_id),
+    CONSTRAINT enr_status_ck CHECK (enr_status IN ('Active', 'Dropped'))
+);