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postgresql - 错误：列 >>?column?<< 指定了多次

问题描述

当我执行以下 UNION ALL 代码以将多个表组合到一个物化视图中时，我收到错误：列 >>?column?<< 指定了多次。正如您在代码上方看到的，我严格遵守原始表格中的序列。

DROP MATERIALIZED VIEW vt_views.poi_test;

CREATE MATERIALIZED VIEW vt_views.poi_test
TABLESPACE pg_default
AS
 SELECT tim_bergname.name,
 tim_bergname.info1 AS hoehe,
 NULL,
 NULL,
 tim_bergname.info2 AS region,
 NULL,
 NULL,
 tim_bergname.geoloc,
 tim_bergname.symbolnummer
 FROM tim_bergname

UNION ALL

SELECT tim_flurname.name,
 NULL,
 NULL,
 NULL,
 NULL,
 NULL,
 NULL,
 tim_flurname.geoloc,
 tim_flurname.symbolnummer
 FROM tim_flurname

UNION ALL

SELECT tim_haus_huette.name,
 NULL,
 tim_haus_huette.info1 AS art,
 NULL,
 tim_haus_huette.info2 AS region,
 NULL,
 NULL,
 tim_haus_huette.geoloc,
 tim_haus_huette.symbolnummer
 FROM tim_haus_huette

UNION ALL

SELECT tim_museum.name,
 NULL,
 tim_museum.info1 AS art,
 NULL,
 NULL,
 NULL,
 tim_museum.kn AS name_lang,
 tim_museum.geoloc,
 tim_museum.symbolnummer
 FROM tim_museum

UNION ALL

... several other SELECTS (shortened because of stackoverflow restrictions)

UNION ALL

SELECT tim_wohnmobilstellplatz.name,
 NULL,
 NULL,
 NULL,
 NULL,
 NULL,
 NULL,
 tim_wohnmobilstellplatz.geoloc,
 tim_wohnmobilstellplatz.symbolnummer
 FROM tim_wohnmobilstellplatz


WITH DATA;

ALTER TABLE vt_views.poi_test
 OWNER TO postgres;

GRANT ALL ON TABLE vt_views.poi TO postgres;
GRANT ALL ON TABLE vt_views.poi TO PUBLIC;

任何想法为什么会这样？是因为例如 info1 使用了 3 次吗？我无法编辑原始表，因为我们有一批正在填充表。谢谢你的帮助！

标签： postgresqlunion-allmaterialized-views

解决方案

NULL问题在于条目的第一个查询。您应该命名相应的列：

SELECT tim_bergname.name,
 tim_bergname.info1 AS hoehe,
 NULL AS mycol1,
 NULL AS mycol2,
 tim_bergname.info2 AS region,
 NULL AS mycol3,
 NULL AS mycol4,
 tim_bergname.geoloc,
 tim_bergname.symbolnummer
 FROM tim_bergname

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