SQL Solution For LeetCode Problem: Delete Duplicate Emails
Solving Delete Duplicate Emails in SQL. Please try yourself first to solve the problem and submit your implementation to LeetCode before looking into solution.
Problem Description
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.
+----+------------------+ | Id | Email | +----+------------------+ | 1 | [email protected] | | 2 | [email protected] | | 3 | [email protected] | +----+------------------+
Id is the primary key column for this table.
For example, after running your query, the above Person table should have the following rows:
+----+------------------+ | Id | Email | +----+------------------+ | 1 | [email protected] | | 2 | [email protected] | +----+------------------+
Note: Your output is the whole Person table after executing your sql. Use delete statement.
See the full details of the problem Delete Duplicate Emails at LeetCode
Originally posted at: @github.com/ignacio-chiazzo/Algorithms-Leetcode-Javascript
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