## Transactions

##### Customers who have made a purchase in the last 30 days

This technical problem involves writing a SQL query to return all customers who have made a purchase in the last 30 days, as well as the total amount they have spent.

193
Nov 27
##### Finding the Total Value of Transactions by Day

Given a table of transactions, this SQL query will find the total value of all transactions that occurred on each day.

168
Nov 25
##### Find the Second Highest Salary in a SQL Database

To find the second highest salary from a SQL database, you can use a subquery. This subquery will return the salary of the employee with the second highest salary.

154
Nov 19
##### Find the total value of all transactions for each day.

Given a table of transactions, this SQL query will find the total value of all transactions for each day.

183
Nov 18
##### "Count the number of occurrences of a character in a string"

This technical problem involves writing a function that takes a string and a character as arguments, and returns the number of times the character appears in the string.

193
Nov 11
##### SQL Query for Average Transaction Value by Day

This problem asks for a SQL query that returns the average transaction value for each day. The example input table has three days, with transaction values of 10, 20, and 30 respectively. The expected output table would have the same three days, with average values of 10, 15, and 20.

248
Nov 10
##### Find all products that cost more than \$10

Write a SQL query to find all products in a table that cost more than \$10.

205
Nov 10
##### Find the 10 most popular articles on a blog

Write a SQL query to find the 10 most popular articles on a blog, based on the number of likes.

218
Nov 09