"Finding Duplicates in a Table"

To find all duplicates in a table with first and last name columns, you can use a SQL query. This query will return all rows where the first and last name match.

Problem

Given a table with column names "FirstName" and "LastName", write a SQL query to find all duplicates in the table.
Example input:
FirstName | LastName
---------|----------
John     | Doe
Jane     | Doe
John     | Smith
Example output:
FirstName | LastName
---------|----------
John     | Doe
Jane     | Doe

Solution

This solution is in SQL. Our A.I. can create solutions in multiple languages.
by sarastevens
SELECT FirstName, LastName
FROM table
GROUP BY FirstName, LastName
HAVING COUNT(*) > 1;

/*

The above solution is optimal because it uses the GROUP BY and HAVING clauses to group the rows by the FirstName and LastName columns and then filter out the groups that have a count greater than 1.

*/

A.I. Evaluation of the Solution

The candidate's solution is correct and demonstrates a good understanding of SQL. The solution is also efficient, using the GROUP BY and HAVING clauses to group and filter the data.

Evaluated at: 2022-11-15 06:15:31