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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

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Oracle Data Integrator (ODI),

Under the hood of the Sunopsis Memory Engine. Part 2

Get our e-books Discover the Oracle Data Integrator 11g Repository Data Model and Oracle Data Integrator Snippets and Recipes In the first part of this series we've had a high level look at the ODI…
Uli Bethke February 1, 2010
Oracle Data Integrator (ODI),

Under the hood of the Sunopsis Memory Engine. Part 1.

Get our e-books Discover the Oracle Data Integrator 11g Repository Data Model and Oracle Data Integrator Snippets and RecipesOracle Data Integrator not only uses hsqldb for its demo environment. It…
Uli Bethke January 23, 2010
Oracle Data Integrator (ODI),

Using subqueries in Oracle Data Integrator (ODI) interfaces for complex data integration requirements

Get our e-books Discover the Oracle Data Integrator 11g Repository Data Model and Oracle Data Integrator Snippets and RecipesOracle Data Integrator does not have any built in functionality for subqueries…
Uli Bethke January 7, 2010
Oracle Data Integrator (ODI),

ODI Snippets: OdiSqlUnload with header

Get our e-books Discover the Oracle Data Integrator 11g Repository Data Model and Oracle Data Integrator Snippets and Recipes OdiSqlUnload is a handy tool to quickly dump the content of…
Uli Bethke November 19, 2009
Oracle Data Integrator (ODI),

ODI snippets: Purge Log and shrink space

Get our e-books Discover the Oracle Data Integrator 11g Repository Data Model and Oracle Data Integrator Snippets and Recipes We all know that we should purge the ODI log on…
Uli Bethke November 17, 2009
SQL,

SQL quiz revisited: ROW_NUMBER, LAST_VALUE, FIRST_VALUE and the SQL knights value problem.

Thank you all for your entries to the recent quiz. The guys from Packt should be shortly sending out the e-books to the winners.Today I will walk you through some…
Uli Bethke November 15, 2009