From bc518ba097e29b08d4801842ae8fcebcc9341ca4 Mon Sep 17 00:00:00 2001 From: Tselot Tessema Date: Thu, 29 Oct 2026 22:57:28 -0400 Subject: [PATCH] Complete SQL assignment 1. --- .../assignments/DC_Cohort/assignment1.sql | 93 +++++++++---------- 1 file changed, 45 insertions(+), 48 deletions(-) diff --git a/02_activities/assignments/DC_Cohort/assignment1.sql b/02_activities/assignments/DC_Cohort/assignment1.sql index a80923591..8ed3a34f6 100644 --- a/02_activities/assignments/DC_Cohort/assignment1.sql +++ b/02_activities/assignments/DC_Cohort/assignment1.sql @@ -6,20 +6,18 @@ --SELECT /* 1. Write a query that returns everything in the customer table. */ --QUERY 1 - - - - +SELECT * +FROM customer; --END QUERY /* 2. Write a query that displays all of the columns and 10 rows from the customer table, 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 @@ -27,10 +25,10 @@ sorted by customer_last_name, then customer_first_ name. */ /* 1. Write a query that returns all customer purchases of product IDs 4 and 9. Limit to 25 rows of output. */ --QUERY 3 - - - - +SELECT * +FROM customer_purchases +WHERE product_id=4 OR product_id=9 +LIMIT 25; --END QUERY @@ -42,10 +40,10 @@ filtered by customer IDs between 8 and 10 (inclusive) using either: Limit to 25 rows of output. */ --QUERY 4 - - - - +SELECT *, quantity *cost_per_quantity AS price +FROM customer_purchases +WHERE product_id BETWEEN 8 AND 10 +LIMIT 25; --END QUERY @@ -55,10 +53,11 @@ Using the product table, write a query that outputs the product_id and product_n 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.” */ --QUERY 5 - - - - +SELECT product_id, product_name, +CASE WHEN product_qty_type='unit' THEN 'unit' +ELSE 'bulk' +END AS product_qty_type_condensed +FROM product; --END QUERY @@ -66,10 +65,10 @@ 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 product_qty_type_condensed, +CASE WHEN product_name LIKE '%pepper%' THEN 1 ELSE 0 END AS pepper_flag +FROM product; --END QUERY @@ -78,10 +77,10 @@ contains the word “pepper” (regardless of capitalization), and otherwise out vendor_id field they both have in common, and sorts the result by market_date, then vendor_name. Limit to 24 rows of output. */ --QUERY 7 - - - - +SELECT vba.market_date, v.vendor_name FROM vendor_booth_assignments AS vba +INNER JOIN vendor AS v ON vba.vendor_id=v.vendor_id +ORDER BY vba.market_date, v.vendor_name +LIMIT 24; --END QUERY @@ -92,10 +91,9 @@ 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(booth_number) +FROM vendor_booth_assignments +GROUP BY vendor_id; --END QUERY @@ -105,10 +103,10 @@ 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 c.customer_id, c.customer_last_name, c.customer_first_name, cp.quantity*cp.cost_per_quantity AS total_spending FROM customer as c +INNER JOIN customer_purchases AS cp ON c.customer_id = cp.customer_id +GROUP BY c.customer_id HAVING total_spending >2000 +ORDER BY customer_last_name, customer_first_name; --END QUERY @@ -124,10 +122,10 @@ 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 temp.new_vendor AS SELECT * FROM vendor; +INSERT INTO temp.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'); +SELECT * FROM temp.new_vendor; --END QUERY @@ -138,10 +136,9 @@ 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 purchase_month, STRFTIME('%Y', market_date) AS purchase_year +FROM customer_purchases +LIMIT 25; --END QUERY @@ -152,8 +149,8 @@ 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, STRFTIME('%m', market_date) AS purchase_month, STRFTIME('%Y', market_date) AS purchase_year, quantity*cost_per_quantity AS customer_spending +FROM customer_purchases +WHERE purchase_month='04' AND purchase_year='2022' +GROUP BY customer_id LIMIT 25; --END QUERY