How to use Window functions in SQL Server

The Ultimate Guide to SQL Window Functions

SQL Window Functions - Window functions in SQL interview sample questions & solutions in ROW NUMBER, RANK, NTILE, LAG, LEAD, PARTITION BY, SQL practice in the playground. - SQLPad.io

Simple and Easy Guide to MySQL Master Master Replication with Code

Replicate MySQL Database : 2 Easy Methods | Hevo

Shashank Mishra on Instagram: "“For a MySQL table with ~1M rows and 50 columns, which runs faster for SUM(colA): GROUP BY or a Window Function — and why?” • In most real systems, GROUP BY is faster when you only need aggregated results. • Window functions are more expensive because they preserve all rows and compute aggregates over partitions. ⸻ ➤ What MySQL is doing internally • GROUP BY – Scans rows – Builds aggregation state (hash or sort based) – Collapses data into one row per group – Produ