Creating Weekly Cost-per-Sales Table Grouped by Age and Geo Using Conditional Aggregation in PostgreSQL

Using Common Table Expressions to Modify Data and Avoid Foreign Key Violations with PostgreSQL

Optimizing LIKE Queries with Custom Trigram Indexes in PostgreSQL

Rebuilding Queries with Joins: A Creative Solution for Data Uniqueness.

Removing Specific Characters from a String Using SQL's Regular Expressions and String Functions

Creating Partitions from a Postgres Table with No Upper Limit Condition Using Range Partitioning

Why Case Expressions Without Filtering Can Lead to 'Ghost' Rows in Your Tables

Counting Parents with at Least One Child Using SQL's EXISTS Clause and Subqueries

How to Get the Rank for a Specific User ID in API Endpoint Activity Logs Using SQL and RANK() Function

Querying Each Student's 3rd Best Assignment Mark in Each Subject Using Window Functions