XML in SQL
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Code Problem / Data Structures and Algorithms / Recursion (32)
Code Problem / Data Structures and Algorithms / Binary Search (30)
Code Problem / Data Structures and Algorithms / Linked Lists (26)
Code Problem / Data Structures and Algorithms / Backtracking (26)
Code Problem / Data Structures and Algorithms / Stacks and Queues (25)
Code Problem / Data Structures and Algorithms / Hashing (24)
Databases / SQL / Backup and Recovery (19)
Code Problem / Data Structures and Algorithms / Arrays and Strings (19)
Databases / SQL / Database Normalization (18)
Code Problem / Data Structures and Algorithms / Time Complexity (17)
Databases / SQL / Locking (16)
Databases / SQL / Replication (15)
Databases / SQL / SQL Queries (13)
Code Problem / Data Structures and Algorithms / Graphs (13)
Databases / SQL / Database Security (13)
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This technical problem involves finding the average salary of all employees in the 'Sales' department. This can be accomplished by writing a query to select all employees in the 'Sales' department and then finding the average salary of those employees.
About this solution: The candidate's solution is complete and solves the problem. The candidate's approach is efficient and uses the WHERE clause to filter the table to only the rows that have the department 'Sales', which reduces the number of rows that need to be processed by the AVG function.
Write a SQL query to find the most recent order date for each customer in a given table. The table should have the following columns: customer_id, customer_name, order_date .
About this solution: The solution above is optimal because it uses the MAX function to find the most recent order date for each customer.
Given a table of employees, this query finds the employees who have been with the company for more than 10 years.
About this solution: The candidate's solution is correct and uses an optimal approach to solving the problem.
To find the row with the highest value in a table, you can use a simple SQL query. Just specify the name and value columns in the SELECT clause, and add a ORDER BY clause to sort the results by value in descending order. Then, use the LIMIT clause to only return the first row from the sorted results.
About this solution: The solution above is optimal because it uses the ORDER BY and LIMIT clauses to sort the table by value in descending order and then return the first row.