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Homework 2 #2

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Homework_1 completed
SidraOB Sep 19, 2024
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SidraOB Sep 19, 2024
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2 changes: 2 additions & 0 deletions 02_activities/homework/homework_1.md
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Expand Up @@ -67,6 +67,8 @@ A logical data model must contain:
- column names
- relationship type

![Logical_data_model.png](./images/Homework_1.png)

Please do not pick the exact same tables that I have already diagramed. For example, you shouldn't diagram the relationship between `product` and `product_category`, but you could diagram `product` and `customer_purchases`.

**A few hints**:
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46 changes: 43 additions & 3 deletions 02_activities/homework/homework_2.sql
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@@ -1,42 +1,82 @@
--SELECT
/* 1. Write a query that returns everything in the customer table. */


SELECT*
FROM customer;

/* 2. Write a query that displays all of the columns and 10 rows from the cus- tomer table,
sorted by customer_last_name, then customer_first_ name. */


SELECT *
FROM customer
ORDER by customer_last_name, customer_first_name
LIMIT 10;


--WHERE
/* 1. Write a query that returns all customer purchases of product IDs 4 and 9. */
-- option 1

SELECT *
FROM customer_purchases
WHERE product_id = 4 OR product_id = 9;

-- option 2

SELECT *
FROM customer_purchases
WHERE product_id in (4,9);

/*2. Write a query that returns all customer purchases and a new calculated column 'price' (quantity * cost_to_customer_per_qty),
filtered by vendor IDs between 8 and 10 (inclusive) using either:
1. two conditions using AND
2. one condition using BETWEEN
*/
-- option 1

SELECT *, quantity*cost_to_customer_per_qty as [price]
from customer_purchases
WHERE vendor_id >= 8 AND vendor_id <= 10;

-- option 2

SELECT *, quantity*cost_to_customer_per_qty as [price]
from customer_purchases
WHERE vendor_id BETWEEN 8 AND 10;

--CASE
/* 1. Products can be sold by the individual unit or by bulk measures like lbs. or oz.
Using the product table, write a query that outputs the product_id and product_name
columns and add a column called prod_qty_type_condensed that displays the word “unit”
if the product_qty_type is “unit,” and otherwise displays the word “bulk.” */

SELECT product_id, product_name,
CASE WHEN product_qty_type = 'unit'
THEN 'unit'
ELSE 'bulk'
END as product_qty_type_condensed
FROM product;

/* 2. We want to flag all of the different types of pepper products that are sold at the market.
add a column to the previous query called pepper_flag that outputs a 1 if the product_name
contains the word “pepper” (regardless of capitalization), and otherwise outputs 0. */

SELECT product_id, product_name,
CASE WHEN product_qty_type = 'unit'
THEN 'unit'
ELSE 'bulk'
END as product_qty_type_condensed
,CASE WHEN product_name like '%pepper%'
THEN '1'
ELSE '0'
end as pepper_flag
FROM product;

--JOIN
/* 1. Write a query that INNER JOINs the vendor table to the vendor_booth_assignments table on the
vendor_id field they both have in common, and sorts the result by vendor_name, then market_date. */

SELECT *
FROM vendor as v
INNER JOIN vendor_booth_assignments as vba
on v.vendor_id = vba.vendor_id
ORDER by vendor_name, market_date;