Alex Hankel - 1 year ago 417

SQL Question

So I am trying to...

Write a SELECT statement that returns these column names and data from the Products table:

- product_name

- list_price

- discount_percent

- discount_amount

- A column that’s calculated from the previous two columns

- discount_price

- A column that’s calculated from the previous three columns

Round the discount_amount and discount_price columns to 2 decimal places.

Sort the result set by discount price in descending sequence.

Use the LIMIT clause so the result set contains only the first 5 rows.

So far I have

`USE my_guitar_shop;`

SELECT product_name, list_price, discount_percent,

CONCAT(discount_percent / 100 * list_price)

AS discount_amount

FROM products

I am able to return

`discount_amount`

How would I also go about returning a second column? Such as

`ROUND(list_price - discount_amount, 2)`

AS discount_price

It says it doesn't recognize discount_amount?

Answer

Use `ROUND()`

instead of CONCAT.

```
ROUND(discount_percent / 100 * list_price, 2)
```

The first argument is the number to round. The second argument is how many decimal places to round to.

http://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_round