sql

In this blog we examine a seemingly simple problem to filter duplicate rows. A duplicate is defined as a row which has email or phone which is not unique. This OR condition complicates the solution significantly.

When dealing with databases and network packet filtering, there is an intriguing conceptual similarity between how SQL queries operate on rows in a database table and how iptables rules operate on network packets. This analogy can provide a deeper understanding of both systems by drawing parallels between their operations.