Three Powerful Ways to Perform Cumulative Queries in SQL

This article explains three techniques for performing cumulative queries in SQL—using a subquery, a Cartesian product with grouping, and a window function—detailing when each method is appropriate, especially for MySQL versions lacking native window support.

Subquerycartesian joincumulative query

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Three Powerful Ways to Perform Cumulative Queries in SQL

Lobster Programming

Jan 13, 2025 · Information Security

How to Detect and Block 3+ Failed Logins Within 10 Seconds Using MySQL and Redis

Learn practical methods to identify users who exceed three failed login attempts within ten seconds, covering both a MySQL log‑table approach with window functions and a Redis‑based solution with key expiration, plus discussion of performance trade‑offs and atomicity considerations.

Brute-force protectionlogin securitymysql

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How to Detect and Block 3+ Failed Logins Within 10 Seconds Using MySQL and Redis

Liangxu Linux

Jun 11, 2022 · Databases

How to Remove Duplicate Rows in SQL Using DISTINCT, GROUP BY, and ROW_NUMBER

This guide explains three SQL techniques—DISTINCT, GROUP BY, and the ROW_NUMBER window function—for deduplicating records, compares their behavior and performance, and provides concrete query examples with a sample task table and additional test cases.

DISTINCTGROUP BYROW_NUMBER

0 likes · 5 min read

How to Remove Duplicate Rows in SQL Using DISTINCT, GROUP BY, and ROW_NUMBER