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chore: Backport #4905 to web (#4907)
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Co-authored-by: Cornelius Roemer <[email protected]>
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prql-bot and corneliusroemer authored Sep 14, 2024
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### `derive` transform

To add columns to a relation, we can use `derive` function. Let's define a new
column for Value Added Tax, set at 19% of the invoice total.
To add columns to a relation, we can use the `derive` function. Let's define a
new column for Value Added Tax, set at 19% of the invoice total.

```prql no-eval
from invoices
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PRQL manipulates relations (tables) of data. The `derive`, `select`, and `join`
transforms change the number of columns in a table. The first two never affect
the number of rows in a table. `join` may change the number of rows, depending
on the variation chosen.
on the chosen type of join.

This final example combines the above into a single query. It illustrates _a
pipeline_ - the fundamental basis of PRQL. We simply add new lines (transforms)
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