Create шестопалов арсений

шестопалов арсений

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+CREATE TABLE seller (
+                        seller_id SERIAL PRIMARY KEY,
+                        full_name TEXT NOT NULL,
+                        gender TEXT NOT NULL,
+                        salary INT NOT NULL
+);
+
+CREATE TABLE client (
+                        client_id SERIAL PRIMARY KEY,
+                        full_name TEXT NOT NULL,
+                        email TEXT,
+                        phone TEXT NOT NULL ,
+                        sex TEXT NOT NULL CHECK ( sex = 'm' or sex = 'f' ),
+                        order_history TEXT,
+                        discount_percent INT,
+                        signed BOOLEAN NOT NULL DEFAULT false
+);
+
+CREATE TABLE product_categories (
+                                    category_id SERIAL PRIMARY KEY,
+                                    category_name TEXT NOT NULL,
+                                    description TEXT
+);
+
+
+CREATE TABLE products (
+                          product_id SERIAL PRIMARY KEY,
+                          product_name TEXT NOT NULL,
+                          category_id SERIAL NOT NULL,
+                          quantity_in_stock INT NOT NULL,
+                          cost_price INT NOT NULL,
+                          manufacturer TEXT NOT NULL,
+                          selling_price FLOAT NOT NULL,
+                          FOREIGN KEY (category_id) REFERENCES product_categories(category_id)
+);
+
+
+CREATE TABLE sales (
+                       sale_id SERIAL PRIMARY KEY,
+                       product_id INT NOT NULL,
+                       selling_price FLOAT NOT NULL,
+                       quantity INT NOT NULL,
+                       sale_date DATE NOT NULL,
+                       seller_id SERIAL NOT NULL,
+                       client_id SERIAL,
+                       FOREIGN KEY (product_id) REFERENCES products(product_id),
+                       FOREIGN KEY (seller_id) REFERENCES seller(seller_id),
+                       FOREIGN KEY (client_id) REFERENCES client(client_id)
+);