Merge pull request 'feed(derived-variables): a teaser that links to the article' (#28) from site/derived-variables-feed into main

Reviewed-on: #28

content/feed/columns-that-are-not-in-the-table/index.md

@@ -0,0 +1,39 @@
+---
+title: 'The column that is not in the table'
+description: 'Derived variables give the EDIT screen columns that do not exist in the table - computed on every read, never stored, and filterable like any other column. The full story is in the article.'
+date: '2026-10-27 09:00:00'
+author: 'Data Controller'
+authorLink: https://www.linkedin.com/showcase/data-controller-for-sas
+tags:
+  - Announcements
+  - Features
+previewImg: './derived-fx.png'
+---
+
+# The column that is not in the table
+
+Every reporting team has a version of this request, and it always sounds like a five minute job: "can we have a region column? It is just the state, mapped. And a line value - quantity times price. We do not need it stored, we just need it on the screen."
+
+It is never a five minute job - so Data Controller now does the obvious thing instead. You write the expression, and the EDIT screen shows the column: computed on every read, never stored, marked `fx` and read-only, so nobody has to wonder whether it is locked or simply has nothing to edit.
+
+The part that took the thinking is that they filter like any other column. That needed a DATA step view rather than a data step, and the reasoning is worth reading: [Derived variables: computed columns you can filter on](/derived-variables/).
+
+Reference: [Derived Variables](https://docs.datacontroller.io/derived-variables/).
+
+If a table of yours has been waiting for "just one more column", we would love to [hear from you](/contact).
+
+<!--
+Feed teaser for the article at /derived-variables/. The article carries the
+engineering - why a computed column is not automatically filterable, the DATA
+step view, the configuration table, the limits - so this post links to it
+rather than repeating it.
+
+Image prompt (cover): a clean, modern illustration on a white background: a
+spreadsheet grid rendered in soft slate and light blue, with the leftmost four
+columns showing plain data and three further columns floating slightly to the
+right, detached from the table, tinted light blue and italicised, each marked
+with a small "fx" badge. A thin left border separates the floating block from
+the stored columns. No text other than the fx badges. Flat vector style, brand
+palette: slate #314351, light blue #d3e5f2, accent green #79a843 used sparingly
+as a single dot.
+-->