Problem Bank for Post Test Problems

We use SQL to manage a vending machine. Our current table goods looks like this:

To help us refill goods that are low in stock, please write a SELECT statement to retrieve the name and brand of all items in the table goods that belongs to type of “chips” and has a quantity of less than 15.

note: When you run the code, there will be several execution results. Please only refer to the last execution result for debugging purposes.

DROP TABLE IF EXISTS goods; create table "goods" ("id" INTEGER, "name" TEXT, "type" TEXT, "brand" TEXT, "quantity" INTEGER); INSERT INTO goods (id,name,type,brand,quantity) VALUES (1, 'classic_chips', 'chips', 'lays', 18), (2, 'cheese_nachos', 'chips', 'doritos', 9), (3, 'sparkling_water', 'drink', 'lacroix', 25), (4, 'classic_chips', 'chips', 'ruffles', 5), (5, 'choco_nuts', 'protein_bar', 'kind', 7); ^^^^ ==== assert 0,0 == cheese_nachos assert 0,1 == lays assert 1,0 == classic_chips assert 1,1 == ruffles

In the same goods table:

We just bought more chips.

Please write an UPDATE statement that: for all entries which type column is chips, add the quantity by 10.

note: When you run the code, there will be several execution results. Please only refer to the last execution result for debugging purposes.

DROP TABLE IF EXISTS goods; create table "goods" ("id" INTEGER, "name" TEXT, "type" TEXT, "brand" TEXT, "quantity" INTEGER); INSERT INTO goods (id,name,type,brand,quantity) VALUES (1, 'classic_chips', 'chips', 'lays', 18), (2, 'cheese_nachos', 'chips', 'doritos', 9), (3, 'sparkling_water', 'drink', 'lacroix', 25), (4, 'classic_chips', 'chips', 'ruffles', 5), (5, 'choco_nuts', 'protein_bar', 'kind', 7); ^^^^ -- Write your code BELOW -- -- Write your code ABOVE -- -- The following lines are for displaying the results. -- Please do not modify. ; SELECT * FROM goods; ==== assert 0,4 == 28 assert 1,4 == 19 assert 2,4 == 25 assert 3,4 == 15 assert 4,4 == 7

Aside from the goods table:

We have another table transactions that looks like this:

Where the goods_id in this table refers to the id in the goods table above.

To provide better service, we want to know when people purchased a type of item and how they paid.

Please write a statement using SELECT and JOIN to: select the type from the goods table and method and date from the transactions table, where the goods_id in the transactions table is the same as the id in the goods table.

note: When you run the code, there will be several execution results. Please only refer to the unittest and the last execution result for debugging purposes.

DROP TABLE IF EXISTS goods; create table "goods" ("id" INTEGER, "name" TEXT, "type" TEXT, "brand" TEXT, "quantity" INTEGER); INSERT INTO goods (id,name,type,brand,quantity) VALUES (1, 'classic_chips', 'chips', 'lays', 18), (2, 'cheese_nachos', 'chips', 'doritos', 9), (3, 'sparkling_water', 'drink', 'lacroix', 25), (4, 'classic_chips', 'chips', 'ruffles', 5), (5, 'choco_nuts', 'protein_bar', 'kind', 7); DROP TABLE IF EXISTS transactions; create table "transactions" ("method" TEXT, "goods_id" INTEGER, "date" DATE); INSERT INTO transactions (method,goods_id,date) VALUES ('cash', '3', '2022-11-10'), ('credit_card', '1', '2022-11-13'), ('credit_card', '2', '2022-11-14'), ('cash', '5', '2022-11-15'); ^^^^ ==== assert 3,1 == protein_bar assert 3,2 == cash

Thank You 🤗

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If you have questions or feedback, or want to know more, please contact Zihan Wu (ziwu@umich.edu).

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