Question

我已阅读了几个问题，但它没有解决我对PostgreSql的问题。

我正在尝试从多个表创建一个View，但是当它实际上在“ ContextLink ”列上时，模式的以下部分会返回“列不存在”错误。我对其他专栏没有同样的问题，所以在解决这个问题时我有点迷失。

Postgres返回

O(|V|*|V|)

我希望我在这里不会错过任何愚蠢的话。非常感谢您的帮助。

干杯，

Answer 1

The column ProjectReferenceDataLibrary_BaseUnit.ContextLink does not exist是正确的，在查询的外层，base_unit子查询已将该列重命名为BaseUnit_ContextLink。因此，您需要检查在外层中创建的每个引用是否都使用子查询的列别名。

试试这个：

CREATE VIEW "Directory"."ProjectReferenceDataLibrary_View" AS 
SELECT    "ProjectReferenceDataLibrary"."UniqueIdentifier", 
          "ProjectReferenceDataLibrary"."ValueTypeDictionary" AS "ValueTypeSet", 
          "ProjectReferenceDataLibrary"."Container", 
          COALESCE("ProjectReferenceDataLibrary_BaseUnit"."BaseUnit",'{}'::text[])                 AS "BaseUnit",
          COALESCE("ProjectReferenceDataLibrary_BaseUnit"."BaseUnit_ContextLink",'{}'::text[])              AS "BaseUnit_ContextLink",
          COALESCE("ProjectReferenceDataLibrary_BaseQuantityKind"."BaseQuantityKind",'{}'::text[]) AS "BaseQuantityKind",
          COALESCE("ProjectReferenceDataLibrary_BaseQuantityKind"."BaseQuantityKind_ContextLink",'{}'::text[])      AS "BaseQuantityKind_ContextLink"
FROM      "Directory"."ProjectReferenceDataLibrary"                                                AS "ProjectReferenceDataLibrary"
LEFT JOIN 
          ( 
                   SELECT   "ProjectReferenceDataLibrary"  AS "UniqueIdentifier", 
                            array_agg("BaseUnit"::text)    AS "BaseUnit", 
                            array_agg("ContextLink"::text) AS "BaseUnit_ContextLink" 
                   FROM     "Directory"."ProjectReferenceDataLibrary_BaseUnit" 
                   JOIN     "Directory"."ProjectReferenceDataLibrary" AS "ProjectReferenceDataLibrary"
                   ON       "ProjectReferenceDataLibrary" = "UniqueIdentifier" 
                   GROUP BY "ProjectReferenceDataLibrary") AS "ProjectReferenceDataLibrary_BaseUnit"
using     ("UniqueIdentifier") 
LEFT JOIN 
          ( 
                   SELECT   "ProjectReferenceDataLibrary"                                           AS "UniqueIdentifier",
                            array[array_agg("OrderKey"::text), array_agg("BaseQuantityKind"::text)] AS "BaseQuantityKind",
                            array_agg("ContextLink"::text)                                          AS "BaseQuantityKind_ContextLink"
                   FROM     "Directory"."ProjectReferenceDataLibrary_BaseQuantityKind" 
                   JOIN     "Directory"."ProjectReferenceDataLibrary" AS "ProjectReferenceDataLibrary"
                   ON       "ProjectReferenceDataLibrary" = "UniqueIdentifier" 
                   GROUP BY "ProjectReferenceDataLibrary") AS "ProjectReferenceDataLibrary_BaseQuantityKind"
using     ("UniqueIdentifier");

在coalesce中不存在postgresql列

1 个答案: