如何在此查询的这一部分中使用 label？

Question

I am trying to figure out why I keep getting the same error when using label this way in this query. I keep getting a syntax error.

SELECT idint, elVal.idinterventovalore, concat(cast(elVal.idinterventovalore as varchar(5)) , '=' , valore as label, 1 like value) -- , elVal.IDInterventoRagg
FROM cch.pats_cch_interventi_valori val 
    INNER JOIN cch.pats_cch_interventielencovalori elVal ON val.idinterventoragg = elVal.idinterventoragg AND val.idinterventovalore = elVal.idinterventovalore 
WHERE elVal.idinterventoragg like '%DiaValvulopatiaSede%' AND elVal.IDTipo='I'
ORDER BY idint, elVal.idinterventovalore;

--and this below is the source code that I am debugging--

SELECT IDInt, 
       elVal.IDInterventoValore, 
       cast(elVal.IDInterventoValore as varchar(5)) + '=' + Valore as label, 
       1 as [value] -- , elVal.IDInterventoRagg 
FROM AppManager_BI.PATS_CCH_Interventi_Valori val 
  INNER JOIN AppManager_BI.PATS_CCH_InterventiElencoValori elVal 
          ON val.IDInterventoRagg = elVal.IDInterventoRagg 
         AND val.IDInterventoValore = elVal.IDInterventoValore 
WHERE elVal.IDInterventoRagg like 'DiaVasculopatiaPerifericaSede' 
  AND elVal.IDTipo='I' 
ORDER BY IDInt, elVal.IDInterventoValore

Answer 1

Although I don't work on postgresql, but I understand that your use of alias inside concat is invalid. Try below code.

SELECT idint, 
           elVal.idinterventovalore, 
           concat(cast(elVal.idinterventovalore as varchar(5)) , '=' , valore, 1) -- , elVal.IDInterventoRagg
      FROM cch.pats_cch_interventi_valori val 
INNER JOIN cch.pats_cch_interventielencovalori elVal 
        ON val.idinterventoragg = elVal.idinterventoragg 
       AND val.idinterventovalore = elVal.idinterventovalore 
     WHERE elVal.idinterventoragg like '%DiaValvulopatiaSede%'
       AND elVal.IDTipo='I'
  ORDER BY idint,
           elVal.idinterventovalore;

Hope this will help you.

Answer 2

Given the original query (presumably T-SQL), you probably want:

SELECT IDInt, elVal.IDInterventoValore, 
       concat(elVal.IDInterventoValore, '=', Valore) as label, 
       1 as value,
...

there is no need to cast the value when using concat()

If you want to properly deal with possible empty values in the two colums, concat_ws() might be a better choice:

SELECT IDInt, elVal.IDInterventoValore, 
       concat_ws('=', elVal.IDInterventoValore, Valore) as label, 
       1 as value,
...