Identifying Users Who Buy the Same Product in the Same Shop More Than Twice in One Year: A Step-by-Step Solution

Using Common Table Expressions (CTEs) to Solve Multiple-Level Mapping Problems with SQL Hierarchical Data

Understanding the Benefits and Best Practices of Using BigQuery's `GENERATE_UUID` Function in Data Management

Calculating Percentage of On-Time Arrivals from BigQuery Standard SQL: A Comprehensive Guide

Grouping on Previous Value: A Big Query Approach for Preserving Data When Steps Progress Backwards

Understanding Window Functions in SQL: A Step-by-Step Guide to Calculating Maximum Order Dates

Optimizing Spatial Queries in BigQuery: The Limitations of Clustering and How to Work Around Them

Using Regular Expressions in BigQuery: A Comprehensive Guide to Match & Replace

Understanding SQL Window Functions for Aggregate Calculations: A Beginner's Guide

Aggregating Length of Time Intervals and Grouping to Fixed Time Grid: A Step-by-Step Solution