Data & Database Workflows (page 28 of 40)
PostgreSQL, SQL, CSV, JSON, Excel, PDF, and conversion pipelines — practical workflows for working with structured data safely.
- SQL Pivot and Unpivot Guide
A practical guide to SQL pivot and unpivot techniques, covering row-to-column reshaping, column-to-row reshaping, reporting use cases, conditional aggregation, dynamic pivots, and real-world query design tradeoffs.
- SQL Practice Questions and Answers
A detailed guide to SQL practice questions and answers with beginner-to-intermediate exercises, explanations, and practical query patterns for learning SQL more effectively.
- SQL PRIMARY KEY vs UNIQUE KEY
A practical guide to SQL PRIMARY KEY vs UNIQUE KEY, covering uniqueness, NULL behavior, row identity, indexing, foreign key relationships, and common schema design mistakes.
- SQL Query Optimization Guide
A practical SQL query optimization guide covering execution plans, indexing, filtering, joins, sorting, grouping, pagination, query rewrites, and the habits that improve performance in real database workloads.
- SQL Recursive CTE Guide
A practical guide to SQL recursive CTEs with clear examples for traversing hierarchies, expanding parent-child relationships, building paths, generating sequences, and avoiding common recursion mistakes.
- SQL ROW_NUMBER, RANK, and DENSE_RANK Guide
A practical guide to SQL ROW_NUMBER, RANK, and DENSE_RANK with clear examples for ranking rows, handling ties, selecting top records per group, and solving real reporting and analytics problems.
- SQL SELECT Statement Explained
A practical guide to the SQL SELECT statement with beginner-friendly explanations, examples, and real query patterns for filtering, sorting, grouping, aliases, expressions, and clean result design.
- SQL Stored Procedures vs Functions
A practical guide to SQL stored procedures vs functions, covering how they differ, how they are used in applications and reporting, where side effects matter, and the design patterns that help technical teams choose the right database logic structure.
- SQL String Functions Guide
A practical guide to SQL string functions covering CONCAT, LENGTH, LOWER, UPPER, TRIM, SUBSTRING, REPLACE, POSITION, LIKE, and the text-cleaning patterns developers, analysts, and data teams use every day.
- SQL Subqueries Explained
A practical guide to SQL subqueries with clear examples for filtering, aggregation, correlated logic, EXISTS, IN, nested queries, and the real-world patterns developers, analysts, and data teams use every day.