title: Computed Column (Microsoft SQL Server 2014)
body: <p><strong>Book</strong></p>
  
  <pre><code>| B_ID |   Name  | Unit_Price|
  |------+---------+-----------|
  |  B01 |   Math  |     25    |
  |  B02 | Science |     34    |
  </code></pre>
  
  <p><strong>Order</strong></p>
  
  <pre><code>| O_ID | B_ID |  Quantity |Total_Price|
  |------+------+-----------+-----------|
  |  O01 |  B01 |     2     |     ?     |
  |  O02 |  B02 |     5     |     ?     |
  </code></pre>
  
  <p>How can I get the <strong>Total_Price</strong> by multiplying <code>Order.Quantity</code> and <code>Book.Unit_Price</code> where <code>Order.B_ID</code> is a FK to <code>Book.B_ID</code>. Thank you!</p>