/* Given the following database schema: */
CREATE TABLE people
(
    "Customer ID"   TEXT,
    "Customer Name" TEXT,
    Segment         TEXT,
    Country         TEXT,
    City            TEXT,
    State           TEXT,
    "Postal Code"   INTEGER,
    Region          TEXT,
    primary key ("Customer ID", Region)
)

CREATE TABLE product
(
    "Product ID"   TEXT,
    "Product Name" TEXT,
    Category       TEXT,
    "Sub-Category" TEXT,
    Region         TEXT,
    primary key ("Product ID", Region)
)

CREATE TABLE central_superstore
(
    "Row ID"      INTEGER
            primary key,
    "Order ID"    TEXT,
    "Order Date"  DATE,
    "Ship Date"   DATE,
    "Ship Mode"   TEXT,
    "Customer ID" TEXT,
    Region        TEXT,
    "Product ID"  TEXT,
    Sales         REAL,
    Quantity      INTEGER,
    Discount      REAL,
    Profit        REAL,
    foreign key ("Customer ID", Region) references people("Customer ID",Region),
    foreign key ("Product ID", Region) references product("Product ID",Region)
)

CREATE TABLE east_superstore
(
    "Row ID"      INTEGER
            primary key,
    "Order ID"    TEXT,
    "Order Date"  DATE,
    "Ship Date"   DATE,
    "Ship Mode"   TEXT,
    "Customer ID" TEXT,
    Region        TEXT,
    "Product ID"  TEXT,
    Sales         REAL,
    Quantity      INTEGER,
    Discount      REAL,
    Profit        REAL,
    foreign key ("Customer ID", Region) references people("Customer ID",Region),
    foreign key ("Product ID", Region) references product("Product ID",Region)
)

CREATE TABLE south_superstore
(
    "Row ID"      INTEGER
            primary key,
    "Order ID"    TEXT,
    "Order Date"  DATE,
    "Ship Date"   DATE,
    "Ship Mode"   TEXT,
    "Customer ID" TEXT,
    Region        TEXT,
    "Product ID"  TEXT,
    Sales         REAL,
    Quantity      INTEGER,
    Discount      REAL,
    Profit        REAL,
    foreign key ("Customer ID", Region) references people("Customer ID",Region),
    foreign key ("Product ID", Region) references product("Product ID",Region)
)

CREATE TABLE west_superstore
(
    "Row ID"      INTEGER
            primary key,
    "Order ID"    TEXT,
    "Order Date"  DATE,
    "Ship Date"   DATE,
    "Ship Mode"   TEXT,
    "Customer ID" TEXT,
    Region        TEXT,
    "Product ID"  TEXT,
    Sales         REAL,
    Quantity      INTEGER,
    Discount      REAL,
    Profit        REAL,
    foreign key ("Customer ID", Region) references people("Customer ID",Region),
    foreign key ("Product ID", Region) references product("Product ID",Region)
)

/* Answer the following: Calculate the total cost of the orders by Brad Thomas in 2016. Brad Thomas is the "Customer Name"; in 2016 refers to strftime('%Y', "Order Date") = '2016'; total cost refers to SUM(SUTRACT(MULTIPLY(DIVIDE(Sales, SUTRACT(1, discount)), Quantity), Profit)) */
SELECT 
SELECT SUM((T1.Sales / (1 - T1.Discount)) * T1.Quantity - T1.Profit) AS cost FROM east_superstore AS T1 INNER JOIN people AS T2 ON T1.`Customer ID` = T2.`Customer ID` INNER JOIN product AS T3 ON T1.`Product ID` = T3.`Product ID` AND T1.Region = T3.Region WHERE T1.Region = 'East' AND T2.`Customer Name` = 'Brad Thomas' AND strftime('%Y', T1.`Order Date`) = '2016'