Speed up plpgsql that counts doc types in a loop?

Question

Is there a way to speed up our plpgsql function that counts certain types of docs all in one query which is executed in a loop? ALL in one query?

validador := (s         


        

Answer 1

It should be faster to assign all four variables in one query (only one table or index scan):

SELECT INTO validador, validador2, validador3, validador4
            sum(CASE id_tipo_cifra WHEN 901 THEN 1 ELSE 0 END)
           ,sum(CASE id_tipo_cifra WHEN 902 THEN 1 ELSE 0 END)
           ,sum(CASE id_tipo_cifra WHEN 905 THEN 1 ELSE 0 END)
           ,sum(CASE id_tipo_cifra WHEN 907 THEN 1 ELSE 0 END)
FROM   webdte.doc_tip_cifra
WHERE  id_doc = id_documento;

Same result.

Normally you would have to check id_doc for NULL in addition, but since you have a WHERE condition with = on it, it cannot be NULL.