LODs in Tableau can be very difficult to wrap your head around. In this blog I outline my way of understanding the syntax behind them so that I can hopefully help others!
The Syntax
{ FIXED [Customer Name]: MIN([Order Date]) }
My Understanding
In my head, I like to replace the word "FIXED" with "for each". Then, after the colon I like to read it as "Work out this calculation for this field."
My Translation
So, I would read the example syntax as: for each customer name, work out their minimum (i.e. first) order date.