updated sample metadata to include column descriptions

metadata.txt

@@ -1,35 +1,35 @@
 CREATE TABLE products (
-  product_id INTEGER PRIMARY KEY,
-  name VARCHAR(50),
-  price DECIMAL(10,2),
-  quantity INTEGER  
+  product_id INTEGER PRIMARY KEY, -- Unique ID for each product
+  name VARCHAR(50), -- Name of the product
+  price DECIMAL(10,2), -- Price of each unit of the product
+  quantity INTEGER  -- Current quantity in stock
 );
 
 CREATE TABLE customers (
-  customer_id INTEGER PRIMARY KEY,
-  name VARCHAR(50),
-  address VARCHAR(100)
+   customer_id INTEGER PRIMARY KEY, -- Unique ID for each customer
+   name VARCHAR(50), -- Name of the customer
+   address VARCHAR(100) -- Mailing address of the customer
 );
 
 CREATE TABLE salespeople (
-  salesperson_id INTEGER PRIMARY KEY, 
-  name VARCHAR(50),
-  region VARCHAR(50)
+  salesperson_id INTEGER PRIMARY KEY, -- Unique ID for each salesperson 
+  name VARCHAR(50), -- Name of the salesperson
+  region VARCHAR(50) -- Geographic sales region 
 );
 
 CREATE TABLE sales (
-  sale_id INTEGER PRIMARY KEY,
-  product_id INTEGER,
-  customer_id INTEGER,
-  salesperson_id INTEGER,
-  sale_date DATE,
-  quantity INTEGER
+  sale_id INTEGER PRIMARY KEY, -- Unique ID for each sale
+  product_id INTEGER, -- ID of product sold
+  customer_id INTEGER,  -- ID of customer who made purchase
+  salesperson_id INTEGER, -- ID of salesperson who made the sale
+  sale_date DATE, -- Date the sale occurred 
+  quantity INTEGER -- Quantity of product sold
 );
 
 CREATE TABLE product_suppliers (
-  supplier_id INTEGER PRIMARY KEY,
-  product_id INTEGER,
-  supply_price DECIMAL(10,2)
+  supplier_id INTEGER PRIMARY KEY, -- Unique ID for each supplier
+  product_id INTEGER, -- Product ID supplied
+  supply_price DECIMAL(10,2) -- Unit price charged by supplier
 );
 
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