diff --git a/02_activities/assignments/DC_Cohort/Assignment1_ERD.drawio b/02_activities/assignments/DC_Cohort/Assignment1_ERD.drawio new file mode 100644 index 000000000..67552e2f0 --- /dev/null +++ b/02_activities/assignments/DC_Cohort/Assignment1_ERD.drawio @@ -0,0 +1,55 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/02_activities/assignments/DC_Cohort/Assignment1_ERD.png b/02_activities/assignments/DC_Cohort/Assignment1_ERD.png new file mode 100644 index 000000000..bd1679a93 Binary files /dev/null and b/02_activities/assignments/DC_Cohort/Assignment1_ERD.png differ diff --git a/02_activities/assignments/DC_Cohort/assignment1.sql b/02_activities/assignments/DC_Cohort/assignment1.sql index a80923591..6e972f5d2 100644 --- a/02_activities/assignments/DC_Cohort/assignment1.sql +++ b/02_activities/assignments/DC_Cohort/assignment1.sql @@ -7,7 +7,8 @@ /* 1. Write a query that returns everything in the customer table. */ --QUERY 1 - +SELECT * +FROM customer; --END QUERY @@ -17,7 +18,10 @@ sorted by customer_last_name, then customer_first_ name. */ --QUERY 2 - +SELECT * +FROM customer +ORDER BY customer_last_name, customer_first_name +LIMIT 10; --END QUERY @@ -28,7 +32,10 @@ sorted by customer_last_name, then customer_first_ name. */ Limit to 25 rows of output. */ --QUERY 3 - +SELECT * +FROM customer_purchases +WHERE product_id IN (4, 9) +LIMIT 25; --END QUERY @@ -43,7 +50,11 @@ Limit to 25 rows of output. */ --QUERY 4 - +SELECT *, + quantity * cost_per_quantity AS price +FROM customer_purchases +WHERE customer_id BETWEEN 8 AND 10 +LIMIT 25; --END QUERY @@ -56,7 +67,13 @@ columns and add a column called prod_qty_type_condensed that displays the word if the product_qty_type is “unit,” and otherwise displays the word “bulk.” */ --QUERY 5 - +SELECT product_id, + product_name, + CASE + WHEN product_qty_type = 'unit' THEN 'unit' + ELSE 'bulk' + END AS prod_qty_type_condensed +FROM product; --END QUERY @@ -66,7 +83,17 @@ if the product_qty_type is “unit,” and otherwise displays the word “bulk. 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. */ --QUERY 6 - +SELECT product_id, + product_name, + CASE + WHEN product_qty_type = 'unit' THEN 'unit' + ELSE 'bulk' + END AS prod_qty_type_condensed, + CASE + WHEN LOWER(product_name) LIKE '%pepper%' THEN 1 + ELSE 0 + END AS pepper_flag +FROM product; @@ -79,6 +106,12 @@ vendor_id field they both have in common, and sorts the result by market_date, t Limit to 24 rows of output. */ --QUERY 7 +SELECT * +FROM vendor +INNER JOIN vendor_booth_assignments + ON vendor.vendor_id = vendor_booth_assignments.vendor_id +ORDER BY market_date, vendor_name +LIMIT 24; @@ -92,7 +125,10 @@ Limit to 24 rows of output. */ /* 1. Write a query that determines how many times each vendor has rented a booth at the farmer’s market by counting the vendor booth assignments per vendor_id. */ --QUERY 8 - +SELECT vendor_id, + COUNT(*) AS booth_rentals +FROM vendor_booth_assignments +GROUP BY vendor_id; @@ -106,7 +142,18 @@ of customers for them to give stickers to, sorted by last name, then first name. HINT: This query requires you to join two tables, use an aggregate function, and use the HAVING keyword. */ --QUERY 9 - +SELECT customer.customer_id, + customer_first_name, + customer_last_name, + SUM(quantity * cost_per_quantity) AS total_spent +FROM customer +INNER JOIN customer_purchases + ON customer.customer_id = customer_purchases.customer_id +GROUP BY customer.customer_id, + customer_first_name, + customer_last_name +HAVING SUM(quantity * cost_per_quantity) > 2000 +ORDER BY customer_last_name, customer_first_name; --END QUERY @@ -124,7 +171,24 @@ When inserting the new vendor, you need to appropriately align the columns to be VALUES(col1,col2,col3,col4,col5) */ --QUERY 10 - +CREATE TEMP TABLE new_vendor AS +SELECT * +FROM vendor; + +INSERT INTO new_vendor ( + vendor_id, + vendor_name, + vendor_type, + vendor_owner_first_name, + vendor_owner_last_name +) +VALUES ( + 10, + 'Thomass Superfood Store', + 'Fresh Focused', + 'Thomas', + 'Rosenthal' +); @@ -138,7 +202,11 @@ HINT: you might need to search for strfrtime modifers sqlite on the web to know and year are! Limit to 25 rows of output. */ --QUERY 11 - +SELECT customer_id, + strftime('%m', market_date) AS month, + strftime('%Y', market_date) AS year +FROM customer_purchases +LIMIT 25; @@ -152,7 +220,12 @@ HINTS: you will need to AGGREGATE, GROUP BY, and filter... but remember, STRFTIME returns a STRING for your WHERE statement... AND be sure you remove the LIMIT from the previous query before aggregating!! */ --QUERY 12 - +SELECT customer_id, + SUM(quantity * cost_per_quantity) AS total_spent +FROM customer_purchases +WHERE strftime('%m', market_date) = '04' + AND strftime('%Y', market_date) = '2022' +GROUP BY customer_id;