SqlExceptionHelper : ERROR: function count(character varying, integer) does not exist

Question

I have a spring application and I have a native query with this syntax:

select  
    COUNT(DISTINCT person.id,(CASE WHEN salary_person.rating = \'Satisfactory\'          


        

Answer 1

Postgres does not support count()with more than one column. You can however simply turn both columns into a single column of an anonymous record type, by using something like: (col_one, col_two) - that is a single column of an an anonymous record type.

select COUNT(DISTINCT (person.id,(CASE WHEN salary_person.rating = 'Satisfactory' THEN 1 END))) AS totalSatisfactory, 
       COUNT(DISTINCT (person.id,(CASE WHEN salary_person.rating = 'Unsatisfactory' THEN 1 END))) AS totalUnsatisfactory
from person
  join salary_person on person.id = salary_person.person_id;   

Note the parentheses around the two columns.

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However, in Postgres you have a more elegant way to do what you want, by using conditional aggregation with the filter clause:

select COUNT(DISTINCT person.id) filter (where salary_person.rating = 'Satisfactory') AS totalSatisfactory, 
       COUNT(DISTINCT person.id) filter (where salary_person.rating = 'Unsatisfactory') AS totalUnsatisfactory
from person
  join salary_person on person.id = salary_person.person_id;