PostgreSQL：查询在带有变量的查询中没有结果数据的目的地

Posted 2023-03-28

【中文标题】PostgreSQL：查询在带有变量的查询中没有结果数据的目的地

【英文标题】：PostgreSQL: Query has no destination for result data in a query with variables

【发布时间】：2020-04-28 19:05:27

【问题描述】：

错误：查询没有结果数据的目的地

提示：如果要丢弃 SELECT 的结果，请改用 PERFORM。

上下文：PL/pgSQL 函数 inline_code_block 第 11 行的 SQL 语句

DO $$
DECLARE
id_renovacion integer := (select Id_renovacionContrato 
from BEA.DIM_RENOVACION_CONTRATO where upper(Desc_renovacionContrato) = 'UNDEFINED'); 

id_renovacionpending integer := (select Id_renovacionContrato 
from BEA.DIM_RENOVACION_CONTRATO where upper(Desc_renovacionContrato) = 'PENDING');


BEGIN

SELECT count(id_contrato) as id_cantidad,
                CASE    when count(id_contrato) = 0 THEN 'ImagesHappyMaritransparente1.png'
                             when count(id_contrato) is null THEN 'ImagesHappyMaritransparente1.png'
                             when count(id_contrato) = 1 THEN 'ImagesTITIhappymarycontratos-off-1_145.png'
                             when count(id_contrato) = 2 THEN 'ImagesTITIhappymarycontratos-off-2_145.png'
                             when count(id_contrato) = 3 THEN 'ImagesTITIhappymarycontratos-off-3_145.png'
                             when count(id_contrato) = 4 THEN 'ImagesTITIhappymarycontratos-off-4_145.png'
                             when count(id_contrato) = 5 THEN 'ImagesTITIhappymarycontratos-off-5_145.png'
                             when count(id_contrato) = 6 THEN 'ImagesTITIhappymarycontratos-off-6_145.png'
                             when count(id_contrato) = 7 THEN 'ImagesTITIhappymarycontratos-off-7_145.png'
                             when count(id_contrato) = 8 THEN 'ImagesTITIhappymarycontratos-off-8_145.png'
                             when count(id_contrato) = 9 THEN 'ImagesTITIhappymarycontratos-off-9_145.png'
                             when count(id_contrato) > 9 THEN 'ImagesTITIhappymarycontratos-off-9+_145.png'
                END
 FROM BEA.FACT_CONTRATOS
WHERE cantDiasDif > 0 AND Id_rangoContrato IN (id_renovacion, id_renovacionpending);

END 
$$

LANGUAGE plpgsql; ```

【问题讨论】：

错误信息非常具有描述性。你明白它在说什么吗？您打算如何处理选定的数据？

您的问题是什么？ “你如何避免：ERROR: query has no destination for result data”？

【参考方案1】：

我可以在发布的代码中看到两个问题。

create 在代码中。我不知道为什么你的匿名块中有create。

您的 DO 块中有以下 SELECT：

SELECT count(id_contrato) as id_cantidad,
                CASE    when count(id_contrato) = 0 THEN 'ImagesHappyMaritransparente1.png'
                             when count(id_contrato) is null THEN 'ImagesHappyMaritransparente1.png'
                             when count(id_contrato) = 1 THEN 'ImagesTITIhappymarycontratos-off-1_145.png'
                             when count(id_contrato) = 2 THEN 'ImagesTITIhappymarycontratos-off-2_145.png'
                             when count(id_contrato) = 3 THEN 'ImagesTITIhappymarycontratos-off-3_145.png'
                             when count(id_contrato) = 4 THEN 'ImagesTITIhappymarycontratos-off-4_145.png'
                             when count(id_contrato) = 5 THEN 'ImagesTITIhappymarycontratos-off-5_145.png'
                             when count(id_contrato) = 6 THEN 'ImagesTITIhappymarycontratos-off-6_145.png'
                             when count(id_contrato) = 7 THEN 'ImagesTITIhappymarycontratos-off-7_145.png'
                             when count(id_contrato) = 8 THEN 'ImagesTITIhappymarycontratos-off-8_145.png'
                             when count(id_contrato) = 9 THEN 'ImagesTITIhappymarycontratos-off-9_145.png'
                             when count(id_contrato) > 9 THEN 'ImagesTITIhappymarycontratos-off-9+_145.png'
                END
 FROM BEA.FACT_CONTRATOS
WHERE cantDiasDif > 0 AND Id_rangoContrato IN (id_renovacion, id_renovacionpending);

而且您没有将 SELECT 的返回结果存储到任何变量中。如果您不关心 SELECT 结果，请使用 PERFORM，如下所示：

PERFORM count(id_contrato) as id_cantidad,
                CASE    when count(id_contrato) = 0 THEN 'ImagesHappyMaritransparente1.png'
                             when count(id_contrato) is null THEN 'ImagesHappyMaritransparente1.png'
                             when count(id_contrato) = 1 THEN 'ImagesTITIhappymarycontratos-off-1_145.png'
                             when count(id_contrato) = 2 THEN 'ImagesTITIhappymarycontratos-off-2_145.png'
                             when count(id_contrato) = 3 THEN 'ImagesTITIhappymarycontratos-off-3_145.png'
                             when count(id_contrato) = 4 THEN 'ImagesTITIhappymarycontratos-off-4_145.png'
                             when count(id_contrato) = 5 THEN 'ImagesTITIhappymarycontratos-off-5_145.png'
                             when count(id_contrato) = 6 THEN 'ImagesTITIhappymarycontratos-off-6_145.png'
                             when count(id_contrato) = 7 THEN 'ImagesTITIhappymarycontratos-off-7_145.png'
                             when count(id_contrato) = 8 THEN 'ImagesTITIhappymarycontratos-off-8_145.png'
                             when count(id_contrato) = 9 THEN 'ImagesTITIhappymarycontratos-off-9_145.png'
                             when count(id_contrato) > 9 THEN 'ImagesTITIhappymarycontratos-off-9+_145.png'
                END
 FROM BEA.FACT_CONTRATOS
WHERE cantDiasDif > 0 AND Id_rangoContrato IN (id_renovacion, id_renovacionpending);

但是，请问您为什么要这样做？让我们知道不存储 SELECT 的结果或您的意图的原因。

【讨论】：

嗨 Vibhor，是的，你是对的，“创建”是代码中的一个错误，我正在尝试解决它，创建一个表并解决它。另外，我应用了您的建议，在代码中添加了 PERFORM 而不是 SELECT，但我需要显示结果，使用 CREATE 已解决。回答您的问题我正在使用它在 BI 应用程序中显示它：MicroStrategy。感谢您的回答

【参考方案2】：

此代码解决问题，使用 CREATE 表显示结果。

DO $$
DECLARE
id_renovacion integer := (select Id_renovacionContrato 
from BEA.DIM_RENOVACION_CONTRATO where upper(Desc_renovacionContrato) = 'UNDEFINED'); 

id_renovacionpending integer := (select Id_renovacionContrato 
from BEA.DIM_RENOVACION_CONTRATO where upper(Desc_renovacionContrato) = 'PENDING');


BEGIN

DROP TABLE if EXISTS  tbcontratos;
CREATE TABLE tbcontratos (id_cantidad integer, images varchar(200));

insert into tbcontratos
SELECT count(id_contrato) as id_cantidad,
                CASE    when count(id_contrato) = 0 THEN 'Images\HappyMari\transparente1.png'
                             when count(id_contrato) is null THEN 'Images\HappyMari\transparente1.png'
                             when count(id_contrato) = 1 THEN 'Images\TITI\happymary\contratos-off-1_145.png'
                             when count(id_contrato) = 2 THEN 'Images\TITI\happymary\contratos-off-2_145.png'
                             when count(id_contrato) = 3 THEN 'Images\TITI\happymary\contratos-off-3_145.png'
                             when count(id_contrato) = 4 THEN 'Images\TITI\happymary\contratos-off-4_145.png'
                             when count(id_contrato) = 5 THEN 'Images\TITI\happymary\contratos-off-5_145.png'
                             when count(id_contrato) = 6 THEN 'Images\TITI\happymary\contratos-off-6_145.png'
                             when count(id_contrato) = 7 THEN 'Images\TITI\happymary\contratos-off-7_145.png'
                             when count(id_contrato) = 8 THEN 'Images\TITI\happymary\contratos-off-8_145.png'
                             when count(id_contrato) = 9 THEN 'Images\TITI\happymary\contratos-off-9_145.png'
                             when count(id_contrato) > 9 THEN 'Images\TITI\happymary\contratos-off-9+_145.png'
                END
 FROM BEA.FACT_CONTRATOS
WHERE cantDiasDif > 0 AND Id_rangoContrato IN (id_renovacion, id_renovacionpending);



END 
$$

LANGUAGE plpgsql;

select id_cantidad, images from tbcontratos; ```