当我执行以下UNION ALL代码将多个表组合到一个实例化视图中时,出现错误:列>>?column?<<多次指定。如您在代码上方所见,我严格遵守原始表中的顺序。
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被使用了3次?我无法编辑原始表,因为我们有一批正在填充表。谢谢您的帮助!
答案 0 :(得分:2)
问题在于第一个查询中的NULL
条目。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