134 lines
6.3 KiB
SQL
134 lines
6.3 KiB
SQL
-- =============================================================================
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-- HOTEL RESERVATIONS — DATA MART (STAR SCHEMA)
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-- Target: Oracle (university lab schema)
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-- Based on A.24 Revenue Data Mart — Dimensional Modelling by Example
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-- =============================================================================
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-- -----------------------------------------------------------------------------
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-- DIMENSION TABLES
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-- -----------------------------------------------------------------------------
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-- YYYYMMDD integer key — cheap date range predicates, no JOIN to calendar needed
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CREATE TABLE DIM_DATE (
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date_key NUMBER(8,0) NOT NULL,
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full_date DATE NOT NULL,
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year NUMBER(4,0) NOT NULL,
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quarter NUMBER(1,0) NOT NULL,
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month NUMBER(2,0) NOT NULL,
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month_name VARCHAR2(10) NOT NULL,
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week_number NUMBER(2,0) NOT NULL,
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day_of_month NUMBER(2,0) NOT NULL,
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day_name VARCHAR2(10) NOT NULL,
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is_weekend NUMBER(1,0) NOT NULL,
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is_business_day NUMBER(1,0) NOT NULL,
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season VARCHAR2(10) NOT NULL, -- Peak / High / Low / Off
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CONSTRAINT pk_dim_date PRIMARY KEY (date_key),
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CONSTRAINT ck_dim_date_wknd CHECK (is_weekend IN (0,1)),
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CONSTRAINT ck_dim_date_bday CHECK (is_business_day IN (0,1))
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);
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CREATE TABLE DIM_COUNTRY (
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country_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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country_id NUMBER(10,0) NOT NULL,
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code CHAR(2) NOT NULL,
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name VARCHAR2(100) NOT NULL,
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currency VARCHAR2(10) NOT NULL,
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CONSTRAINT pk_dim_country PRIMARY KEY (country_key),
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CONSTRAINT uq_dim_cntry_id UNIQUE (country_id)
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);
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CREATE TABLE DIM_STAR_RATING (
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star_rating_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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star_rating_id NUMBER(10,0) NOT NULL,
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code NUMBER(1,0) NOT NULL,
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description VARCHAR2(20) NOT NULL,
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CONSTRAINT pk_dim_star PRIMARY KEY (star_rating_key),
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CONSTRAINT uq_dim_star_id UNIQUE (star_rating_id)
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);
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CREATE TABLE DIM_HOTEL_CHAIN (
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hotel_chain_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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hotel_chain_id NUMBER(10,0) NOT NULL,
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code VARCHAR2(10) NOT NULL,
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name VARCHAR2(100) NOT NULL,
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CONSTRAINT pk_dim_chain PRIMARY KEY (hotel_chain_key),
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CONSTRAINT uq_dim_chain_id UNIQUE (hotel_chain_id)
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);
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CREATE TABLE DIM_HOTEL (
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hotel_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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hotel_id NUMBER(10,0) NOT NULL,
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hotel_chain_key NUMBER(10,0),
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country_key NUMBER(10,0) NOT NULL,
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star_rating_key NUMBER(10,0) NOT NULL,
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code VARCHAR2(20) NOT NULL,
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name VARCHAR2(150) NOT NULL,
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city VARCHAR2(100) NOT NULL,
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CONSTRAINT pk_dim_hotel PRIMARY KEY (hotel_key),
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CONSTRAINT uq_dim_hotel_id UNIQUE (hotel_id),
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CONSTRAINT fk_dh_chain FOREIGN KEY (hotel_chain_key) REFERENCES DIM_HOTEL_CHAIN (hotel_chain_key),
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CONSTRAINT fk_dh_country FOREIGN KEY (country_key) REFERENCES DIM_COUNTRY (country_key),
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CONSTRAINT fk_dh_star FOREIGN KEY (star_rating_key) REFERENCES DIM_STAR_RATING (star_rating_key)
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);
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CREATE TABLE DIM_ROOM (
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room_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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room_id NUMBER(10,0) NOT NULL,
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hotel_key NUMBER(10,0) NOT NULL,
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room_number VARCHAR2(10) NOT NULL,
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floor NUMBER(3,0) NOT NULL,
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room_type_code VARCHAR2(20) NOT NULL,
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room_type_desc VARCHAR2(100) NOT NULL,
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smoking_yn NUMBER(1,0) NOT NULL,
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standard_rate NUMBER(10,2) NOT NULL,
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CONSTRAINT pk_dim_room PRIMARY KEY (room_key),
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CONSTRAINT uq_dim_room_id UNIQUE (room_id),
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CONSTRAINT fk_dr_hotel FOREIGN KEY (hotel_key) REFERENCES DIM_HOTEL (hotel_key),
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CONSTRAINT ck_dim_room_smk CHECK (smoking_yn IN (0,1))
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);
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CREATE TABLE DIM_GUEST (
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guest_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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guest_id NUMBER(10,0) NOT NULL,
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country_key NUMBER(10,0),
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name VARCHAR2(150) NOT NULL,
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city VARCHAR2(100),
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CONSTRAINT pk_dim_guest PRIMARY KEY (guest_key),
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CONSTRAINT uq_dim_guest_id UNIQUE (guest_id),
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CONSTRAINT fk_dg_country FOREIGN KEY (country_key) REFERENCES DIM_COUNTRY (country_key)
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);
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-- -----------------------------------------------------------------------------
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-- FACT TABLE
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-- -----------------------------------------------------------------------------
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-- Grain: one row per room_booking
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-- Revenue measures: nightly_rate, total_amount, nights_stayed
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CREATE TABLE FACT_ROOM_BOOKING (
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fact_id NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
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-- foreign keys
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hotel_key NUMBER(10,0) NOT NULL,
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hotel_chain_key NUMBER(10,0),
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room_key NUMBER(10,0) NOT NULL,
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guest_key NUMBER(10,0) NOT NULL,
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country_key NUMBER(10,0),
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star_rating_key NUMBER(10,0) NOT NULL,
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checkin_date_key NUMBER(8,0) NOT NULL,
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checkout_date_key NUMBER(8,0) NOT NULL,
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-- degenerate dimensions
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booking_status VARCHAR2(20) NOT NULL,
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-- measures
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nights_stayed NUMBER(4,0) NOT NULL,
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nightly_rate NUMBER(10,2) NOT NULL,
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total_amount NUMBER(12,2) NOT NULL,
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CONSTRAINT pk_fact_rb PRIMARY KEY (fact_id),
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CONSTRAINT fk_frb_hotel FOREIGN KEY (hotel_key) REFERENCES DIM_HOTEL (hotel_key),
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CONSTRAINT fk_frb_chain FOREIGN KEY (hotel_chain_key) REFERENCES DIM_HOTEL_CHAIN (hotel_chain_key),
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CONSTRAINT fk_frb_room FOREIGN KEY (room_key) REFERENCES DIM_ROOM (room_key),
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CONSTRAINT fk_frb_guest FOREIGN KEY (guest_key) REFERENCES DIM_GUEST (guest_key),
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CONSTRAINT fk_frb_country FOREIGN KEY (country_key) REFERENCES DIM_COUNTRY (country_key),
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CONSTRAINT fk_frb_star FOREIGN KEY (star_rating_key) REFERENCES DIM_STAR_RATING (star_rating_key),
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CONSTRAINT fk_frb_checkin FOREIGN KEY (checkin_date_key) REFERENCES DIM_DATE (date_key),
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CONSTRAINT fk_frb_checkout FOREIGN KEY (checkout_date_key) REFERENCES DIM_DATE (date_key)
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);
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