lianghsun/bird-text2sql-bench huggingface dataset:
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
Give the number of territories in the "Northern" region.

### Hint
"Northern" region refers to RegionDescription = 'Northern'

### SQL
SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Northern'
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
Which region is "Columbia" in?

### Hint
region refers to RegionID; "Columbia" refers to TerritoryDescription = 'Columbia'

### SQL
SELECT T2.RegionDescription FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T1.TerritoryDescription = 'Columbia'
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
For the orders of Customer "WHITC", what is the percentage of the orders were fulfilled with shipper company "United Package"?

### Hint
Customer "WHITC" refers to CustomerID = 'WHITC'; shipper company "United Package" refers to CompanyName = 'United Package'; percentage = divide(count(ShipperID where CompanyName = 'United Package') , count(ShipperID)) * 100%

### SQL
SELECT CAST(COUNT(CASE WHEN T2.CompanyName = 'United Package' THEN 1 ELSE NULL END) AS REAL) * 100 / COUNT(T1.OrderID) FROM Orders AS T1 INNER JOIN Shippers AS T2 ON T1.ShipVia = T2.ShipperID WHERE T1.CustomerID = 'WHITC'
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
How many percent more orders were fulfilled with shipper company "United Package" than with "Speedy Express"?

### Hint
percent = divide(subtract(count(OrderID where CompanyName = 'United Package') , count(OrderID where CompanyName = 'Speedy Express')) , count(OrderID where CompanyName = 'Speedy Express')) * 100%

### SQL
SELECT CAST((COUNT(CASE WHEN T2.CompanyName = 'United Package' THEN 1 ELSE NULL END) - COUNT(CASE WHEN T2.CompanyName = 'Speedy Express' THEN 1 ELSE NULL END)) AS REAL) * 100 / COUNT(CASE WHEN T2.CompanyName = 'Speedy Express' THEN 1 ELSE NULL END) FROM Orders AS T1 INNER JOIN Shippers AS T2 ON T1.ShipVia = T2.ShipperID
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
How many times is the number of territories in "Eastern Region" than "Southern Region"?

### Hint
"Eastern Region" refers to RegionDescription = 'Eastern'; "Southern Region" refers to RegionDescription = 'Southern'; times = divide(count(TerritoryDescription where RegionDescription = 'Eastern') , count(TerritoryDescription where RegionDescription = 'Southern'))

### SQL
SELECT CAST(( SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Eastern' ) AS REAL) / ( SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Southern' ) AS Calu
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
How many customers are there in the country with the highest number of customers?

### Hint
highest number refers to max(count(CustomerID))

### SQL
SELECT COUNT(CustomerID) FROM Customers GROUP BY Country ORDER BY COUNT(CustomerID) DESC LIMIT 1
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
What are the order ids of the orders with freight of over 800?

### Hint
freight of over 800 refers to Freight > 800

### SQL
SELECT OrderID FROM Orders WHERE Freight > 800
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
What is the Island Trading customer's complete address?

### Hint
Island Trading refers to CompanyName = 'Island Trading'; complete address = Address, City, Region, Country, PostalCode

### SQL
SELECT Address, City, Region, Country, PostalCode FROM Customers WHERE CompanyName = 'Island Trading'
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
What is the most expensive product?

### Hint
product refers to ProductName; most expensive refers to max(UnitPrice)

### SQL
SELECT ProductName FROM Products WHERE UnitPrice = ( SELECT MAX(UnitPrice) FROM Products )
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
How many suppliers are there in the United States of America?

### Hint
United States of America refers to Country = 'USA'

### SQL
SELECT COUNT(SupplierID) FROM Suppliers WHERE Country = 'USA'
### Database Schema
CREATE TABLE sqlite_sequence(name,seq)

CREATE TABLE Categories
(
    CategoryID INTEGER PRIMARY KEY AUTOINCREMENT,
    CategoryName TEXT,
    Description TEXT
)

CREATE TABLE Customers
(
    CustomerID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT
)

CREATE TABLE Employees
(
    EmployeeID INTEGER PRIMARY KEY AUTOINCREMENT,
    LastName TEXT,
    FirstName TEXT,
    BirthDate DATE,
    Photo TEXT,
    Notes TEXT
)

CREATE TABLE Shippers(
    ShipperID INTEGER PRIMARY KEY AUTOINCREMENT,
    ShipperName TEXT,
    Phone TEXT
)

CREATE TABLE Suppliers(
    SupplierID INTEGER PRIMARY KEY AUTOINCREMENT,
    SupplierName TEXT,
    ContactName TEXT,
    Address TEXT,
    City TEXT,
    PostalCode TEXT,
    Country TEXT,
    Phone TEXT
)

CREATE TABLE Products(
    ProductID INTEGER PRIMARY KEY AUTOINCREMENT,
    ProductName TEXT,
    SupplierID INTEGER,
    CategoryID INTEGER,
    Unit TEXT,
    Price REAL DEFAULT 0,
	FOREIGN KEY (CategoryID) REFERENCES Categories (CategoryID),
	FOREIGN KEY (SupplierID) REFERENCES Suppliers (SupplierID)
)

CREATE TABLE Orders(
    OrderID INTEGER PRIMARY KEY AUTOINCREMENT,
    CustomerID INTEGER,
    EmployeeID INTEGER,
    OrderDate DATETIME,
    ShipperID INTEGER,
    FOREIGN KEY (EmployeeID) REFERENCES Employees (EmployeeID),
    FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID),
    FOREIGN KEY (ShipperID) REFERENCES Shippers (ShipperID)
)

CREATE TABLE OrderDetails(
    OrderDetailID INTEGER PRIMARY KEY AUTOINCREMENT,
    OrderID INTEGER,
    ProductID INTEGER,
    Quantity INTEGER,
	FOREIGN KEY (OrderID) REFERENCES Orders (OrderID),
	FOREIGN KEY (ProductID) REFERENCES Products (ProductID)
)

### Question
Which product have the highest user satisfaction?

### Hint
product refers to ProductName; highest user satisfaction refers to max(ReorderLevel)

### SQL
SELECT ProductName FROM Products WHERE ReorderLevel = ( SELECT MAX(ReorderLevel) FROM Products )