Conditional Row Numbering in PrestoDB: A Step-by-Step Solution Using Cumulative Group Numbers and Dense Ranks

Optimizing Performance with Amazon Athena: Querying Large Datasets on S3

Calculating Active IDs by Day Using Cumulative Sum Aggregation in Athena

Extracting Values from Non-Monotonic Changes in Time Series Data: A Solution Using Window Functions and Date Arithmetic

Counting Unique Names in Athena: Handling Updates and Inserts Separately

Finding Records Present in Multiple Groups Across Different Database Schemes

Dynamic Unpivot Approach in Presto SQL: A Flexible Solution for Handling Dynamic Data