ERROR: query has no destination for result data in postgres

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SQL

CREATE OR REPLACE FUNCTION master.test2(tehsil text, district text, state text, flag text)
  RETURNS setof master.population AS
$BODY$
BEGIN


  IF flag='A' THEN
    select Count(*) from master.population where income in('1','2')and statecode=state;
  ELSIF flag='B' THEN
 select Count(*) from master.population where income in('1','2') and statecode=state and districtcode=district ;
   ELSIF flag='C' THEN
  select Count(*) from master.population where income in('1','2') and statecode=state and districtcode=district and tehsilcode=tehsil;
  
 
ELSE
     select Count(*) from master.population where income in('1','2'); 
END IF;

END;
$BODY$
  LANGUAGE plpgsql

Throwing an error:

VB

ERROR:  query has no destination for result data
HINT:  If you want to discard the results of a SELECT, use PERFORM instead.
CONTEXT:  PL/pgSQL function master.test2(text,text,text,text) line 6 at SQL statement

Posted 21-May-13 19:33pm

Anusha Srivastava

Updated 21-May-13 19:49pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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Anusha Srivastava · Accepted Answer · 2013-06-05T18:46:00

i solved it like this:

CREATE OR REPLACE FUNCTION master.test2(tehsil text, district text, state text, flag text)
RETURNS int AS
$BODY$
BEGIN
Declare
ione int;
IF flag='A' THEN
select COALESCE (Count(*))into ione from master.population where income in('1','2')and statecode=state;
ELSIF flag='B' THEN
select COALESCE (Count(*)) into ione from master.population where income in('1','2') and statecode=state and districtcode=district ;
ELSIF flag='C' THEN
select COALESCE(Count(*)) into ione from master.population where income in('1','2') and statecode=state and districtcode=district and tehsilcode=tehsil;

ELSE
select COALESCE (Count(*)) into ione from master.population where income in('1','2');
END IF;

return ione;
END;
$BODY$
LANGUAGE plpgsql