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Data Lineage,

SQL Visualisation Guide – Query Diagrams, Lineage & ERD

Have you ever inherited the SQL codebase from someone else where it is in a “bit of a mess”? 😁 Sound familiar? Most data engineers and SQL developers have been there including myself—staring at a spaghetti-like web of queries, trying to untangle a chaotic SQL codebase. It’s a common nightmare. Traditionally, you had to fight …
Uli Bethke November 3, 2024
SQL,

SQL Challenge: Tackling the Island Problem in Time Series Data

Jump into our SQL Challenge! Today, we're exploring customer loyalty trends. Are you prepared to show off your SQL skills? About the quiz In this SQL pop quiz, we're challenging…
Uli Bethke November 7, 2023
XML,

XML Converters & Conversion – Ultimate Guide (2025)

“Urgent XML Conversion Project – Need by End of Week”. “Just Convert this XML to SQL Tables. Should be Simple!” Sound familiar?  From my experience, XML conversion projects follow the…
Maciek October 4, 2023
Snowflake,

7 guardrails against common mistakes that inflate Snowflake credit usage 

Dodge costly pitfalls Snowflake implementation has pioneered dozens of innovations in the data platform space. The long list includes separation of compute and storage, physical workload separation, data sharing, data…
Uli Bethke September 13, 2023
SQL,

Detect Bad SQL with Static & Dynamic Code Analysis – A Guide

Preventing Query Catastrophe with FlowHigh SQL Analyser Does the following sound familiar? As the wizard EsQuEl delved deep into the SQL code, he stumbled upon multiple instances where tables were…
Uli Bethke September 8, 2023

Recent Articles

All JSON Snowflake XML
JSON, JSON,

Working with JSON in Redshift. Options, limitations, and alternatives

Redshift offers limited support to work with JSON documents. We have three options to load JSON data into Redshift. We can convert JSON to a relational model when loading the…
Uli Bethke April 24, 2019
XML,

Paranoid? Masking, anonymizing, and obfuscating PII in XML and JSON data

Data masking, anonymization, and obfuscation are methods to scramble personally identifiable information (PII). We can apply different techniques to mask data, e.g. you may substitute values (swap na for another)…
Maciek April 1, 2019
Data Warehouse,

The evolution of cloud data warehousing

Let’s have a look at the evolution of cloud data warehousing. It’s hard to believe, but just a few years ago all data warehouses were run on-premise. Some of them…
Uli Bethke February 13, 2019
Snowflake,

Snowflake date and time dimension

Here is a simple SQL script that will generate a date dimension in Snowflake. We are using the built-in GENERATOR and SEQ function. Start date for the dimension is 2017-01-01.…
Uli Bethke January 28, 2019
XML,

Converting IRS Form 990 XML to text and Excel

In 2016, the IRS released data in electronic form to the nonprofit sector. Each of these files, contains data about nonprofit finance and more. You can get all that data…
Maciek December 18, 2018
Snowflake,

Oracle SQL Developer Data Modeler with Snowflake

Why Oracle SQL Data Modeler Oracle Sql Developer Data Modeler (SDDM) is a free-to-use data modeling tool born to support developers while designing their database, or architecture, at a logical,…
Uli Bethke November 28, 2018