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-- INIT SCRIPT: PostgreSQL Data Warehouse
-- Star Schema for Olist E-commerce
-- ============================================================
-- Create additional database for Airflow
SELECT 'CREATE DATABASE airflow_db' WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'airflow_db')\gexec
-- Switch to main DW database
\c ecommerce_dw;
-- ============================================================
-- DIMENSION TABLES
-- ============================================================
CREATE TABLE IF NOT EXISTS dim_time (
date_key INTEGER PRIMARY KEY,
full_date DATE NOT NULL,
day_of_week SMALLINT NOT NULL, -- 0=Monday, 6=Sunday
day_name VARCHAR(10) NOT NULL,
day_of_month SMALLINT NOT NULL,
week_of_year SMALLINT NOT NULL,
month SMALLINT NOT NULL,
month_name VARCHAR(10) NOT NULL,
quarter SMALLINT NOT NULL,
year SMALLINT NOT NULL,
is_weekend BOOLEAN NOT NULL DEFAULT FALSE,
is_holiday BOOLEAN NOT NULL DEFAULT FALSE
);
CREATE TABLE IF NOT EXISTS dim_geography (
geo_key SERIAL PRIMARY KEY,
zip_code_prefix VARCHAR(10) NOT NULL,
city VARCHAR(100),
state CHAR(2),
state_name VARCHAR(50),
region VARCHAR(20),
latitude DOUBLE PRECISION,
longitude DOUBLE PRECISION,
UNIQUE(zip_code_prefix)
);
CREATE TABLE IF NOT EXISTS dim_customer (
customer_key SERIAL PRIMARY KEY,
customer_id VARCHAR(50) NOT NULL,
customer_unique_id VARCHAR(50) NOT NULL,
zip_code VARCHAR(10),
city VARCHAR(100),
state CHAR(2),
segment VARCHAR(20) DEFAULT 'standard',
lifetime_value DECIMAL(12, 2) DEFAULT 0,
order_count INTEGER DEFAULT 0,
first_order_date TIMESTAMP,
last_order_date TIMESTAMP,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
UNIQUE(customer_id)
);
CREATE TABLE IF NOT EXISTS dim_product (
product_key SERIAL PRIMARY KEY,
product_id VARCHAR(50) NOT NULL,
category_pt VARCHAR(100),
category_en VARCHAR(100),
weight_g INTEGER,
length_cm INTEGER,
height_cm INTEGER,
width_cm INTEGER,
photos_qty SMALLINT,
name_length INTEGER,
desc_length INTEGER,
UNIQUE(product_id)
);
CREATE TABLE IF NOT EXISTS dim_seller (
seller_key SERIAL PRIMARY KEY,
seller_id VARCHAR(50) NOT NULL,
zip_code VARCHAR(10),
city VARCHAR(100),
state CHAR(2),
total_orders INTEGER DEFAULT 0,
avg_rating DECIMAL(3, 2) DEFAULT 0,
total_revenue DECIMAL(14, 2) DEFAULT 0,
category_focus VARCHAR(100),
UNIQUE(seller_id)
);
-- ============================================================
-- FACT TABLES
-- ============================================================
CREATE TABLE IF NOT EXISTS fact_orders (
order_key BIGSERIAL PRIMARY KEY,
order_id VARCHAR(50) NOT NULL,
customer_key INTEGER REFERENCES dim_customer(customer_key),
seller_key INTEGER REFERENCES dim_seller(seller_key),
product_key INTEGER REFERENCES dim_product(product_key),
date_key INTEGER REFERENCES dim_time(date_key),
geography_key INTEGER REFERENCES dim_geography(geo_key),
-- Order attributes
order_status VARCHAR(20) NOT NULL,
item_count SMALLINT DEFAULT 1,
-- Financial measures
total_price DECIMAL(12, 2),
total_freight DECIMAL(12, 2),
total_payment DECIMAL(12, 2),
-- Payment details
payment_type VARCHAR(20),
payment_installments SMALLINT,
-- Review measures
review_score SMALLINT,
review_has_text BOOLEAN DEFAULT FALSE,
-- Delivery measures
delivery_days INTEGER,
estimated_delivery_days INTEGER,
delivery_delay_days INTEGER,
is_late_delivery BOOLEAN DEFAULT FALSE,
-- Timestamps
purchase_timestamp TIMESTAMP,
approved_timestamp TIMESTAMP,
shipped_timestamp TIMESTAMP,
delivered_timestamp TIMESTAMP,
estimated_delivery_date TIMESTAMP,
review_timestamp TIMESTAMP,
-- Metadata
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
UNIQUE(order_id)
);
CREATE TABLE IF NOT EXISTS fact_order_items (
item_key BIGSERIAL PRIMARY KEY,
order_id VARCHAR(50) NOT NULL,
order_item_id SMALLINT NOT NULL,
product_key INTEGER REFERENCES dim_product(product_key),
seller_key INTEGER REFERENCES dim_seller(seller_key),
price DECIMAL(12, 2),
freight_value DECIMAL(12, 2),
shipping_limit_date TIMESTAMP,
UNIQUE(order_id, order_item_id)
);
CREATE TABLE IF NOT EXISTS fact_payments (
payment_key BIGSERIAL PRIMARY KEY,
order_id VARCHAR(50) NOT NULL,
payment_sequential SMALLINT NOT NULL,
payment_type VARCHAR(20),
payment_installments SMALLINT,
payment_value DECIMAL(12, 2),
UNIQUE(order_id, payment_sequential)
);
CREATE TABLE IF NOT EXISTS fact_reviews (
review_key BIGSERIAL PRIMARY KEY,
review_id VARCHAR(50) NOT NULL,
order_id VARCHAR(50) NOT NULL,
review_score SMALLINT,
review_comment_title TEXT,
review_comment_message TEXT,
review_creation_date TIMESTAMP,
review_answer_timestamp TIMESTAMP,
UNIQUE(review_id)
);
-- ============================================================
-- AGGREGATION TABLES
-- ============================================================
CREATE TABLE IF NOT EXISTS agg_daily_revenue (
date DATE PRIMARY KEY,
total_revenue DECIMAL(14, 2),
total_freight DECIMAL(14, 2),
gmv DECIMAL(14, 2),
order_count INTEGER,
avg_order_value DECIMAL(10, 2),
unique_customers INTEGER,
item_count INTEGER
);
CREATE TABLE IF NOT EXISTS agg_category_performance (
id SERIAL PRIMARY KEY,
category_en VARCHAR(100),
year_month VARCHAR(7),
revenue DECIMAL(14, 2),
order_count INTEGER,
avg_review_score DECIMAL(3, 2),
avg_price DECIMAL(10, 2),
seller_count INTEGER,
UNIQUE(category_en, year_month)
);
CREATE TABLE IF NOT EXISTS agg_seller_ranking (
seller_key INTEGER PRIMARY KEY REFERENCES dim_seller(seller_key),
seller_id VARCHAR(50),
city VARCHAR(100),
state CHAR(2),
total_revenue DECIMAL(14, 2),
total_freight DECIMAL(14, 2),
order_count INTEGER,
item_count INTEGER,
avg_rating DECIMAL(3, 2),
avg_delivery_days DECIMAL(5, 1),
late_delivery_pct DECIMAL(5, 2),
category_focus VARCHAR(100)
);
CREATE TABLE IF NOT EXISTS agg_customer_segments (
segment VARCHAR(20) PRIMARY KEY,
customer_count INTEGER,
avg_ltv DECIMAL(10, 2),
avg_orders DECIMAL(5, 2),
avg_review_score DECIMAL(3, 2),
total_revenue DECIMAL(14, 2)
);
-- ============================================================
-- INDEXES
-- ============================================================
CREATE INDEX IF NOT EXISTS idx_fact_orders_purchase_ts ON fact_orders(purchase_timestamp);
CREATE INDEX IF NOT EXISTS idx_fact_orders_status ON fact_orders(order_status);
CREATE INDEX IF NOT EXISTS idx_fact_orders_customer ON fact_orders(customer_key);
CREATE INDEX IF NOT EXISTS idx_fact_orders_seller ON fact_orders(seller_key);
CREATE INDEX IF NOT EXISTS idx_fact_orders_product ON fact_orders(product_key);
CREATE INDEX IF NOT EXISTS idx_fact_orders_date ON fact_orders(date_key);
CREATE INDEX IF NOT EXISTS idx_fact_order_items_order ON fact_order_items(order_id);
CREATE INDEX IF NOT EXISTS idx_fact_payments_order ON fact_payments(order_id);
CREATE INDEX IF NOT EXISTS idx_fact_reviews_order ON fact_reviews(order_id);
CREATE INDEX IF NOT EXISTS idx_dim_customer_unique ON dim_customer(customer_unique_id);
CREATE INDEX IF NOT EXISTS idx_dim_customer_state ON dim_customer(state);
CREATE INDEX IF NOT EXISTS idx_agg_daily_revenue_date ON agg_daily_revenue(date);
-- ============================================================
-- POPULATE dim_time (2016-2019)
-- ============================================================
INSERT INTO dim_time (date_key, full_date, day_of_week, day_name, day_of_month,
week_of_year, month, month_name, quarter, year, is_weekend)
SELECT
TO_CHAR(d, 'YYYYMMDD')::INTEGER as date_key,
d as full_date,
EXTRACT(DOW FROM d)::SMALLINT as day_of_week,
TO_CHAR(d, 'Day') as day_name,
EXTRACT(DAY FROM d)::SMALLINT as day_of_month,
EXTRACT(WEEK FROM d)::SMALLINT as week_of_year,
EXTRACT(MONTH FROM d)::SMALLINT as month,
TO_CHAR(d, 'Month') as month_name,
EXTRACT(QUARTER FROM d)::SMALLINT as quarter,
EXTRACT(YEAR FROM d)::SMALLINT as year,
EXTRACT(DOW FROM d) IN (0, 6) as is_weekend
FROM generate_series('2016-01-01'::date, '2019-12-31'::date, '1 day'::interval) d
ON CONFLICT (date_key) DO NOTHING;
-- Brazilian state regions mapping
INSERT INTO dim_geography (zip_code_prefix, city, state, state_name, region) VALUES
('00000', 'Unknown', 'XX', 'Unknown', 'Unknown')
ON CONFLICT (zip_code_prefix) DO NOTHING;
RAISE NOTICE 'PostgreSQL Data Warehouse initialized successfully!';
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