126 lines
3.8 KiB
SQL
126 lines
3.8 KiB
SQL
-- ===============================================
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-- DDL-скрипт: определение структуры хранилища
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-- Запускается ОДИН РАЗ при инициализации БД
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-- или при изменении схемы (миграции)
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-- ===============================================
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-- 1. Схемы
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DROP SCHEMA IF EXISTS stg CASCADE;
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DROP SCHEMA IF EXISTS ods CASCADE;
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DROP SCHEMA IF EXISTS dds CASCADE;
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CREATE SCHEMA stg;
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CREATE SCHEMA ods;
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CREATE SCHEMA dds;
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-- 2. STG: сырые данные (как пришли)
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CREATE TABLE stg.customers_raw (
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customer_id TEXT,
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email TEXT,
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phone TEXT,
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city TEXT,
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_load_ts TIMESTAMP DEFAULT NOW()
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);
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CREATE TABLE stg.orders_raw (
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order_id TEXT,
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order_date TEXT,
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customer_id TEXT
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);
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CREATE TABLE stg.order_items_raw (
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order_item_id TEXT,
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order_id TEXT,
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product_id TEXT,
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qty TEXT,
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price_at_sale TEXT
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);
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CREATE TABLE stg.products_raw (
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product_id TEXT,
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name TEXT
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);
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-- 3. ODS: очищенные данные
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CREATE TABLE ods.customers (
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customer_id INT,
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email VARCHAR(100),
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phone VARCHAR(20),
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city VARCHAR(50)
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);
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CREATE TABLE ods.orders (
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order_id INT,
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order_date DATE,
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customer_id INT
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);
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CREATE TABLE ods.order_items (
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order_item_id INT,
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order_id INT,
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product_id INT,
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qty INT,
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price_at_sale NUMERIC(10,2)
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);
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CREATE TABLE ods.products (
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product_id INT,
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name VARCHAR(100)
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);
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-- Первичные ключи в ODS (для ускорения и валидации)
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ALTER TABLE ods.customers ADD PRIMARY KEY (customer_id);
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ALTER TABLE ods.orders ADD PRIMARY KEY (order_id);
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ALTER TABLE ods.order_items ADD PRIMARY KEY (order_item_id);
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ALTER TABLE ods.products ADD PRIMARY KEY (product_id);
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-- 4. DDS: интегрированная модель
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-- dim_date: справочник дат (без первичного ключа — генерируется)
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CREATE TABLE dds.dim_date (
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date_key INT PRIMARY KEY,
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date_actual DATE NOT NULL,
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year SMALLINT,
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quarter SMALLINT,
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month SMALLINT,
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day SMALLINT,
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weekday_name VARCHAR(10),
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weekday_num SMALLINT,
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is_first_week BOOLEAN
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);
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-- dim_product: измерение "Товар"
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CREATE TABLE dds.dim_product (
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product_sk BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
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product_bk INT NOT NULL,
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product_name VARCHAR(100) NOT NULL
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);
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-- dim_customer: измерение "Клиент" с SCD Type 2
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CREATE TABLE dds.dim_customer (
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customer_sk BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
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customer_bk INT NOT NULL,
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email VARCHAR(100),
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phone VARCHAR(20),
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city VARCHAR(50),
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valid_from DATE NOT NULL,
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valid_to DATE NOT NULL DEFAULT '9999-12-31',
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is_current BOOLEAN NOT NULL DEFAULT TRUE
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);
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-- fact_sales: факт "Продажи"
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CREATE TABLE dds.fact_sales (
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sale_id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
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customer_sk BIGINT NOT NULL,
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product_sk BIGINT NOT NULL,
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date_key INT NOT NULL,
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quantity INT NOT NULL CHECK (quantity > 0),
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amount NUMERIC(18,2) NOT NULL CHECK (amount >= 0)
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);
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-- Внешние ключи (опционально — в продакшене часто отключают ради скорости)
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ALTER TABLE dds.fact_sales
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ADD CONSTRAINT fk_fact_customer FOREIGN KEY (customer_sk) REFERENCES dds.dim_customer(customer_sk),
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ADD CONSTRAINT fk_fact_product FOREIGN KEY (product_sk) REFERENCES dds.dim_product(product_sk),
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ADD CONSTRAINT fk_fact_date FOREIGN KEY (date_key) REFERENCES dds.dim_date(date_key);
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