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prepravljena data mart sema i generator jebemliga

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Veljko Tosic
2026-05-19 15:46:11 +02:00
parent 571c749e25
commit 946e4020d9
2 changed files with 182 additions and 173 deletions
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346
sql/datamart_schema.sql
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@@ -1,179 +1,187 @@
-- =============================================================================
-- HOTEL RESERVATIONS — DATA MART (STAR SCHEMA)
-- Target: Oracle (university lab schema)
-- =============================================================================
create table ETL_WATERMARK
(
ENTITY_NAME VARCHAR2(50) not null
constraint PK_ETL_WATERMARK
primary key,
LAST_KEY NUMBER(20) default 0 not null,
LAST_RUN_TS TIMESTAMP(6) default SYSTIMESTAMP
)
/
-- -----------------------------------------------------------------------------
-- ETL CONTROL TABLE
-- Tracks incremental load watermarks per entity.
-- -----------------------------------------------------------------------------
create table STG_HOTEL
(
HOTEL_ID NUMBER(10) not null,
HOTEL_CODE VARCHAR2(20) not null,
HOTEL_NAME VARCHAR2(150) not null,
CITY VARCHAR2(100) not null,
COUNTRY_CODE CHAR(2) not null,
COUNTRY_NAME VARCHAR2(100) not null,
CURRENCY VARCHAR2(10) not null,
CHAIN_CODE VARCHAR2(10),
CHAIN_NAME VARCHAR2(100),
STAR_RATING NUMBER(1) not null,
STAR_DESCRIPTION VARCHAR2(20)
)
/
CREATE TABLE ETL_WATERMARK (
entity_name VARCHAR2(50) NOT NULL,
last_key NUMBER(20,0) DEFAULT 0 NOT NULL,
last_run_ts TIMESTAMP DEFAULT SYSTIMESTAMP,
CONSTRAINT pk_etl_wm PRIMARY KEY (entity_name)
);
create table DIM_DATE
(
DATE_KEY NUMBER(8) not null
constraint PK_DIM_DATE
primary key,
FULL_DATE DATE not null,
YEAR NUMBER(4) not null,
QUARTER NUMBER(1) not null,
MONTH NUMBER(2) not null,
MONTH_NAME VARCHAR2(10) not null,
WEEK_NUMBER NUMBER(2) not null,
DAY_OF_MONTH NUMBER(2) not null,
DAY_NAME VARCHAR2(10) not null,
IS_WEEKEND NUMBER(1) not null
constraint CK_DIM_DATE_WEEKEND
check (is_weekend IN (0, 1)),
IS_BUSINESS_DAY NUMBER(1) not null
constraint CK_DIM_DATE_BUSINESS
check (is_business_day IN (0, 1)),
SEASON VARCHAR2(10) not null
)
/
INSERT INTO ETL_WATERMARK (entity_name, last_key) VALUES ('FACT_ROOM_BOOKING', 0);
COMMIT;
create table DIM_HOTEL
(
HOTEL_KEY NUMBER(10) default "IPZ19438"."ISEQ$$_303891".nextval generated as identity
constraint PK_DIM_HOTEL
primary key,
SOURCE_HOTEL_ID NUMBER(10) not null,
HOTEL_CODE VARCHAR2(20) not null,
HOTEL_NAME VARCHAR2(150) not null,
CITY VARCHAR2(100) not null,
COUNTRY_CODE CHAR(2) not null,
COUNTRY_NAME VARCHAR2(100) not null,
CURRENCY VARCHAR2(10) not null,
CHAIN_CODE VARCHAR2(10),
CHAIN_NAME VARCHAR2(100),
STAR_RATING NUMBER(1) not null,
STAR_DESCRIPTION VARCHAR2(20),
EFFECTIVE_DATE DATE not null,
EXPIRY_DATE DATE,
IS_CURRENT NUMBER(1) default 1 not null
constraint CK_DIM_HOTEL_CURRENT
check (is_current IN (0, 1))
)
/
-- -----------------------------------------------------------------------------
-- STAGING TABLES
-- NiFi loads raw MySQL data here first; SCD logic runs in pure SQL after.
-- Truncated at the start of each ETL run.
-- -----------------------------------------------------------------------------
create table DIM_ROOM
(
ROOM_KEY NUMBER(10) generated as identity
constraint PK_DIM_ROOM
primary key,
SOURCE_ROOM_ID NUMBER(10) not null
constraint UQ_DIM_ROOM
unique,
HOTEL_KEY NUMBER(10) not null
constraint FK_DIM_ROOM_HOTEL
references DIM_HOTEL,
ROOM_NUMBER VARCHAR2(10) not null,
FLOOR NUMBER(3) not null,
ROOM_TYPE_CODE VARCHAR2(20) not null,
ROOM_TYPE_DESCRIPTION VARCHAR2(100) not null,
SMOKING_YN NUMBER(1) not null
constraint CK_DIM_ROOM_SMOKING
check (smoking_yn IN (0, 1)),
STANDARD_RATE NUMBER(10, 2) not null
)
/
CREATE TABLE STG_HOTEL (
hotel_id NUMBER(10,0) NOT NULL,
chain_code VARCHAR2(10),
country_code CHAR(2) NOT NULL,
star_code NUMBER(1,0) NOT NULL,
code VARCHAR2(20) NOT NULL,
name VARCHAR2(150) NOT NULL,
city VARCHAR2(100) NOT NULL
);
create table DIM_GUEST
(
GUEST_KEY NUMBER(10) generated as identity
constraint PK_DIM_GUEST
primary key,
SOURCE_GUEST_ID NUMBER(10) not null
constraint UQ_DIM_GUEST
unique,
GUEST_NAME VARCHAR2(150) not null,
CITY VARCHAR2(100),
COUNTRY_CODE CHAR(2),
COUNTRY_NAME VARCHAR2(100)
)
/
-- -----------------------------------------------------------------------------
-- DIMENSION TABLES
-- -----------------------------------------------------------------------------
create table FACT_ROOM_BOOKING
(
FACT_ID NUMBER(10) default "IPZ19438"."ISEQ$$_303902".nextval generated as identity
constraint PK_FACT_ROOM_BOOKING
primary key,
SOURCE_RB_ID NUMBER(10) not null
constraint UQ_FACT_ROOM_BOOKING_SRC
unique,
HOTEL_KEY NUMBER(10) not null
constraint FK_FACT_HOTEL
references DIM_HOTEL,
ROOM_KEY NUMBER(10) not null
constraint FK_FACT_ROOM
references DIM_ROOM,
GUEST_KEY NUMBER(10) not null
constraint FK_FACT_GUEST
references DIM_GUEST,
BOOKING_CREATED_DATE_KEY NUMBER(8) not null
constraint FK_FACT_BOOKING_DATE
references DIM_DATE,
CHECKIN_DATE_KEY NUMBER(8) not null
constraint FK_FACT_CHECKIN_DATE
references DIM_DATE,
CHECKOUT_DATE_KEY NUMBER(8) not null
constraint FK_FACT_CHECKOUT_DATE
references DIM_DATE,
BOOKING_STATUS VARCHAR2(20) not null,
BOOKING_COUNT NUMBER(1) default 1 not null
constraint CK_FACT_BOOKING_COUNT
check (booking_count = 1),
NIGHTS_STAYED NUMBER(4) not null,
NIGHTLY_RATE NUMBER(10, 2) not null,
TOTAL_AMOUNT NUMBER(12, 2) not null
)
/
-- YYYYMMDD integer key — cheap date range predicates, no JOIN to calendar needed
CREATE TABLE DIM_DATE (
date_key NUMBER(8,0) NOT NULL,
full_date DATE NOT NULL,
year NUMBER(4,0) NOT NULL,
quarter NUMBER(1,0) NOT NULL,
month NUMBER(2,0) NOT NULL,
month_name VARCHAR2(10) NOT NULL,
week_number NUMBER(2,0) NOT NULL,
day_of_month NUMBER(2,0) NOT NULL,
day_name VARCHAR2(10) NOT NULL,
is_weekend NUMBER(1,0) NOT NULL,
is_business_day NUMBER(1,0) NOT NULL,
season VARCHAR2(10) NOT NULL,
CONSTRAINT pk_dim_date PRIMARY KEY (date_key),
CONSTRAINT ck_dim_date_wknd CHECK (is_weekend IN (0,1)),
CONSTRAINT ck_dim_date_bday CHECK (is_business_day IN (0,1))
);
create table STG_GUEST
(
SOURCE_GUEST_ID NUMBER(10) not null,
GUEST_NAME VARCHAR2(150) not null,
CITY VARCHAR2(100),
COUNTRY_CODE CHAR(2),
COUNTRY_NAME VARCHAR2(100)
)
/
-- SCD Type 1 — country attributes are stable; just overwrite if anything changes
CREATE TABLE DIM_COUNTRY (
country_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
country_id NUMBER(10,0) NOT NULL,
code CHAR(2) NOT NULL,
name VARCHAR2(100) NOT NULL,
currency VARCHAR2(10) NOT NULL,
CONSTRAINT pk_dim_country PRIMARY KEY (country_key),
CONSTRAINT uq_dim_cntry_id UNIQUE (country_id)
);
create table STG_ROOM
(
SOURCE_ROOM_ID NUMBER(10) not null,
HOTEL_CODE VARCHAR2(20) not null,
ROOM_NUMBER VARCHAR2(10) not null,
FLOOR NUMBER(3) not null,
ROOM_TYPE_CODE VARCHAR2(20) not null,
ROOM_TYPE_DESCRIPTION VARCHAR2(100) not null,
SMOKING_YN NUMBER(1) not null,
STANDARD_RATE NUMBER(10, 2) not null,
HOTEL_ID NUMBER(10)
)
/
-- SCD Type 1 — star rating lookup, never changes
CREATE TABLE DIM_STAR_RATING (
star_rating_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
star_rating_id NUMBER(10,0) NOT NULL,
code NUMBER(1,0) NOT NULL,
description VARCHAR2(20) NOT NULL,
CONSTRAINT pk_dim_star PRIMARY KEY (star_rating_key),
CONSTRAINT uq_dim_star_id UNIQUE (star_rating_id)
);
create table STG_ROOM_BOOKING
(
SOURCE_RB_ID NUMBER(10) not null,
GUEST_ID NUMBER(10) not null,
BOOKING_CREATED_DATE DATE not null,
CHECKIN_DATE DATE not null,
CHECKOUT_DATE DATE not null,
BOOKING_STATUS VARCHAR2(20) not null,
BOOKING_COUNT NUMBER(1) default 1 not null,
NIGHTS_STAYED NUMBER(4) not null,
NIGHTLY_RATE NUMBER(10, 2) not null,
TOTAL_AMOUNT NUMBER(12, 2) not null,
HOTEL_ID NUMBER(10) not null,
ROOM_ID NUMBER(10) not null
)
/
-- SCD Type 1 — chain name/code rarely changes; overwrite
CREATE TABLE DIM_HOTEL_CHAIN (
hotel_chain_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
hotel_chain_id NUMBER(10,0) NOT NULL,
code VARCHAR2(10) NOT NULL,
name VARCHAR2(100) NOT NULL,
CONSTRAINT pk_dim_chain PRIMARY KEY (hotel_chain_key),
CONSTRAINT uq_dim_chain_id UNIQUE (hotel_chain_id)
);
-- SCD Type 2 — hotels can change star rating or chain affiliation over time.
-- source_hotel_id is the natural key from MySQL; hotel_key is the surrogate.
-- One hotel can have multiple rows; IS_CURRENT=1 row is the active version.
-- FACT_ROOM_BOOKING links to the hotel version current at check-in date.
CREATE TABLE DIM_HOTEL (
hotel_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
source_hotel_id NUMBER(10,0) NOT NULL,
hotel_chain_key NUMBER(10,0),
country_key NUMBER(10,0) NOT NULL,
star_rating_key NUMBER(10,0) NOT NULL,
code VARCHAR2(20) NOT NULL,
name VARCHAR2(150) NOT NULL,
city VARCHAR2(100) NOT NULL,
-- SCD2 versioning
effective_date DATE NOT NULL,
expiry_date DATE,
is_current NUMBER(1,0) DEFAULT 1 NOT NULL,
CONSTRAINT pk_dim_hotel PRIMARY KEY (hotel_key),
CONSTRAINT ck_dh_current CHECK (is_current IN (0,1)),
CONSTRAINT fk_dh_chain FOREIGN KEY (hotel_chain_key) REFERENCES DIM_HOTEL_CHAIN (hotel_chain_key),
CONSTRAINT fk_dh_country FOREIGN KEY (country_key) REFERENCES DIM_COUNTRY (country_key),
CONSTRAINT fk_dh_star FOREIGN KEY (star_rating_key) REFERENCES DIM_STAR_RATING (star_rating_key)
);
-- SCD Type 1 — room type/floor rarely changes; upsert is sufficient
CREATE TABLE DIM_ROOM (
room_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
room_id NUMBER(10,0) NOT NULL,
hotel_key NUMBER(10,0) NOT NULL,
room_number VARCHAR2(10) NOT NULL,
floor NUMBER(3,0) NOT NULL,
room_type_code VARCHAR2(20) NOT NULL,
room_type_desc VARCHAR2(100) NOT NULL,
smoking_yn NUMBER(1,0) NOT NULL,
standard_rate NUMBER(10,2) NOT NULL,
CONSTRAINT pk_dim_room PRIMARY KEY (room_key),
CONSTRAINT uq_dim_room_id UNIQUE (room_id),
CONSTRAINT fk_dr_hotel FOREIGN KEY (hotel_key) REFERENCES DIM_HOTEL (hotel_key),
CONSTRAINT ck_dim_room_smk CHECK (smoking_yn IN (0,1))
);
-- SCD Type 1 — guest contact details are overwritten if they change
CREATE TABLE DIM_GUEST (
guest_key NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
guest_id NUMBER(10,0) NOT NULL,
country_key NUMBER(10,0),
name VARCHAR2(150) NOT NULL,
city VARCHAR2(100),
CONSTRAINT pk_dim_guest PRIMARY KEY (guest_key),
CONSTRAINT uq_dim_guest_id UNIQUE (guest_id),
CONSTRAINT fk_dg_country FOREIGN KEY (country_key) REFERENCES DIM_COUNTRY (country_key)
);
-- -----------------------------------------------------------------------------
-- FACT TABLE
-- -----------------------------------------------------------------------------
-- Grain: one row per room_booking.
-- source_rb_id: natural key from MySQL — used for idempotent incremental loads.
-- hotel_key: points to the DIM_HOTEL version active at check-in (SCD2 lookup).
CREATE TABLE FACT_ROOM_BOOKING (
fact_id NUMBER(10,0) GENERATED ALWAYS AS IDENTITY,
source_rb_id NUMBER(10,0) NOT NULL,
-- dimension FKs
hotel_key NUMBER(10,0) NOT NULL,
hotel_chain_key NUMBER(10,0),
room_key NUMBER(10,0) NOT NULL,
guest_key NUMBER(10,0) NOT NULL,
country_key NUMBER(10,0),
star_rating_key NUMBER(10,0) NOT NULL,
checkin_date_key NUMBER(8,0) NOT NULL,
checkout_date_key NUMBER(8,0) NOT NULL,
-- degenerate dimension
booking_status VARCHAR2(20) NOT NULL,
-- measures
nights_stayed NUMBER(4,0) NOT NULL,
nightly_rate NUMBER(10,2) NOT NULL,
total_amount NUMBER(12,2) NOT NULL,
CONSTRAINT pk_fact_rb PRIMARY KEY (fact_id),
CONSTRAINT uq_fact_rb_src UNIQUE (source_rb_id),
CONSTRAINT fk_frb_hotel FOREIGN KEY (hotel_key) REFERENCES DIM_HOTEL (hotel_key),
CONSTRAINT fk_frb_chain FOREIGN KEY (hotel_chain_key) REFERENCES DIM_HOTEL_CHAIN (hotel_chain_key),
CONSTRAINT fk_frb_room FOREIGN KEY (room_key) REFERENCES DIM_ROOM (room_key),
CONSTRAINT fk_frb_guest FOREIGN KEY (guest_key) REFERENCES DIM_GUEST (guest_key),
CONSTRAINT fk_frb_country FOREIGN KEY (country_key) REFERENCES DIM_COUNTRY (country_key),
CONSTRAINT fk_frb_star FOREIGN KEY (star_rating_key) REFERENCES DIM_STAR_RATING (star_rating_key),
CONSTRAINT fk_frb_checkin FOREIGN KEY (checkin_date_key) REFERENCES DIM_DATE (date_key),
CONSTRAINT fk_frb_checkout FOREIGN KEY (checkout_date_key) REFERENCES DIM_DATE (date_key)
);