EasySQL challenge #95WHEREIN

Filter Rows Matching a List of Values with IN

Return the payments made by credit card or debit card.

The challenge runs on the SQLabHub practice database (SQLite) and uses the payments table. You can solve it in the browser, with nothing to install.

Solve This SQL Challenge

The task

Find payments made by credit card or debit card.

A correct answer returns 42 rows with 8 columns: id, order_id, user_id, amount, method, status, paid_at, transaction_id.

Tables used in this challenge

`payments` 200 rows

id INTEGER (PK) · order_id INTEGER · user_id INTEGER · amount REAL · method TEXT · status TEXT · paid_at TEXT · transaction_id TEXT

First 3 rows of the payments table
id	order_id	user_id	amount	method	status	paid_at	transaction_id
1	46	105	921.62	Gift Card	success	2022-05-18	TXNHTN4GIK5L
2	157	37	1723.82	Bank Transfer	success	2024-11-11	TXNKJPIXJOFP
3	45	36	978.76	Bank Transfer	refunded	2023-10-24	TXNU2RW4MK1R

The first rows of each table are shown. See how all the tables relate on the database schema page.

Expected output

Expected output of the challenge
id	order_id	user_id	amount	method	status	paid_at	transaction_id
5	18	57	538.06	Debit Card	success	2022-02-22	TXN2HY68WN6E
26	63	37	241.89	Debit Card	refunded	2023-06-01	TXN4XFF3O7I1
29	184	46	185.2	Credit Card	success	2023-09-01	TXNV95C8IPCF
32	178	57	1220.58	Debit Card	success	2023-05-25	TXN2LMBSK9JN
33	61	129	431.58	Debit Card	success	2024-09-12	TXNMJXDDQ0VF

First 5 of 42 rows. This is the output of the model solution on the practice database. The task does not fix a sort order, so your rows may come back in a different order.

What you practise

Returning every column of a table with SELECT *
Filtering rows with a WHERE condition
Matching a column against a list of values with IN

Hint and approach

Try the challenge first. Open these only when you need them.

Show the hint

Use IN with both card methods

Show the step-by-step approach

How the model solution is built, in the order the database evaluates it:

Read from the payments table.
Filter in WHERE: keep the rows where method is one of 'Credit Card' or 'Debit Card'.
Return every column with SELECT *.

Model solution

Checking your session…

What to watch for

IN ('Credit Card', 'Debit Card') is shorthand for two equality tests joined by OR, and it stays readable as the list grows. The values must match the stored text exactly, capitals and space included: 'credit card' finds nothing.

IN. NOT IN returns no rows at all if the list contains a NULL. With literal lists that is easy to avoid; with a subquery it is a common trap.
WHERE. WHERE is evaluated before the SELECT list, so it cannot use a column alias defined there or the result of an aggregate.
SELECT *. SELECT * is fine for exploring, but its output changes whenever a column is added to the table. Queries that feed a report should name their columns.