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Lech Cieślik's blogs
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How to Disable Specific Options in Select Many Item using Template Directives and CSS
Jan 26 · 2 min read · When working with the Select Many component in Oracle APEX, there is often a need to limit what the user can select. A classic example is a book ordering system: we want to show all books, but the ones that are currently unavailable should be visible...
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APEX Tips for Responsive and Mobile-Friendly Apps
Jan 19 · 2 min read · Recently I have been working on an application that should be responsive, look good on mobile devices, and be based on previously prepared mockups. Of course, it was not possible without custom CSS.But APEX itself gives us a few nice tricks that can ...
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Spatial Illusions in APEX: Trusting SDO_ANYINTERACT Can Be a Mistake
Nov 3, 2025 · 4 min read · Today we’ll take a closer look at functions like SDO_ANYINTERACT, SDO_RELATE, and SDO_INSIDE. I’m not going to rewrite the documentation or explain all the differences between them - definitely not! Instead, I want to focus on one interesting case th...
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Spatial Illusions in APEX: Why Coordinate Systems Matter More Than You Think
Oct 31, 2025 · 7 min read · In our previous article, we explored how map projections work - and why Greenland looks much bigger than it really is. We saw how projecting a round Earth onto a flat map always causes some distortion, just like trying to flatten an orange peel onto ...
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