--- title: "Imam Hambali (@imamhambali) | Hashnode" description: "Imam Hambali (@imamhambali) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@imamhambali" --- @imamhambali # Imam Hambali @imamhambali · Joined January 2026 ### [PostgreSQL to BigQuery: Simple Data Type Mapping](https://imamhambali.hashnode.dev/postgresql-to-bigquery-data-type-mapping?utm_source=hashnode&utm_medium=feed) Simple guide to map PostgreSQL data types to BigQuery. Covers TIMESTAMP, TIMESTAMPTZ, JSON, arrays, and common migration pitfalls. Save time debugging type 4 min read · [imamhambali.hashnode.dev](https://imamhambali.hashnode.dev/postgresql-to-bigquery-data-type-mapping?utm_source=hashnode&utm_medium=feed) [Feb 5](https://hashnode.com/posts/postgresql-to-bigquery-data-type-mapping/698461b501b09d0eb990a831) ### [Data Wrangling and Analysis in Ecommerce-Pt2](https://imamhambali.hashnode.dev/data-wrangling-and-analysis-in-ecommerce-pt2?utm_source=hashnode&utm_medium=feed) This is Part 2. If you haven't read Part 1, check it out here , I covered data wrangling, cleaning, and analysis of sales by state and order trends. Question 3: Does Late Delivery Hurt Customer Satisfaction? Late delivery is a common problem in e-com... 5 min read · [imamhambali.hashnode.dev](https://imamhambali.hashnode.dev/data-wrangling-and-analysis-in-ecommerce-pt2?utm_source=hashnode&utm_medium=feed) [Jan 30](https://hashnode.com/posts/data-wrangling-and-analysis-in-ecommerce-pt2/697cf095b8c24b8b1c2e1533) ### [Data Wrangling and Analysis in Ecommerce-Pt1](https://imamhambali.hashnode.dev/data-wrangling-and-analysis-in-ecommerce-pt1?utm_source=hashnode&utm_medium=feed) In e-commerce, data helps businesses make better decisions and improve customer experience. But before we can analyze data, we need to clean and transform it first , that's what data wrangling is about. This can be simple stuff like removing missing ... 10 min read · [imamhambali.hashnode.dev](https://imamhambali.hashnode.dev/data-wrangling-and-analysis-in-ecommerce-pt1?utm_source=hashnode&utm_medium=feed) [Jan 30](https://hashnode.com/posts/data-wrangling-and-analysis-in-ecommerce-pt1/697ceb1eb8c24b8b1c2e1500) ### [How to Validate Credit Card Numbers using Luhn Algorithm in Excel](https://imamhambali.hashnode.dev/validate-credit-card-luhn-algorithm-excel?utm_source=hashnode&utm_medium=feed) Learn how to validate credit card numbers in Excel using the Luhn Algorithm. Includes a step-by-step guide, modern MAP/LAMBDA formulas, and a free downloada 4 min read · [imamhambali.hashnode.dev](https://imamhambali.hashnode.dev/validate-credit-card-luhn-algorithm-excel?utm_source=hashnode&utm_medium=feed) [Jan 25](https://hashnode.com/posts/validate-credit-card-luhn-algorithm-excel/6975f74b066acf44ac292b6c)