How to re-use result for SELECT, WHERE and ORDER BY clauses?

Question

The following query returns the venues near us (lat: 62.0, lon: 25.0) inside whose radius we fall in ordered by distance:

SELECT *, 
     earth_distance(ll_t         


        

Answer 1

You can also create stand alone or packaged function and use it in your queries:

 SELECT *
   FROM ...
  WHERE distance <= your_function()  -- OR your_package_name.your_function()
 ORDER BY ...

You can use your function in select:

Select your_function() 
  From your_table...
 Where  ...