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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 (2024)

“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,

Automatically detect bad SQL. Static and dynamic analysis of SQL code

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

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SQL, FlowHigh,

SQL antipatterns:  SELECT DISTINCT

The DISTINCT operator The DISTINCT operator is used to eliminate duplicates in a resultset, e.g. we can use it to identify the unique number of customers who made a purchase.…
Uli Bethke August 9, 2022
Snowflake, Snowflake,

Best Practices for implementing a Data Lake on Snowflake

Data lakes. An introduction Data lakes are a common and useful design pattern in modern data architecture. Contrary to a widespread belief, data lakes have been around for a long…
Uli Bethke April 20, 2022
Snowflake, Snowflake,

Date Dimension with Global Holiday Calendar

Overview A date dimension is an essential table in a data model that allows to analyze performance more effectively across different time periods. It should be included in every dimensional…
Uli Bethke March 21, 2022
Snowflake, Snowflake,

Canada Postal Code on Snowflake Marketplace

Overview Canada’s postal codes are alphanumeric, like Dutch, Irish, and British postcodes. Canadian postal codes are in the format A1A 1A1, where A is a letter and 1 is a…
Uli Bethke January 25, 2022
Snowflake, Snowflake,

Administrative Boundaries USA

Overview The dataset Administrative Boundaries USA contains border information as polygons about the following divisions of the fifty states, the District of Columbia, Puerto Rico, and the Island areas (American…
Uli Bethke December 20, 2021
Snowflake,

Data Warehouse 3.0. A Reference Architecture for the Modern Data Warehouse.

Reference data architecture for data management and analytics. An introduction. I frequently come across data architecture diagrams that are riddled with vendor names, tools, and technologies. Tools and technologies have…
Uli Bethke December 9, 2021