sp_MSForEachDB Ugyldig brug af bivirkningsoperatør i funktionen

Du kan ikke gøre dette dynamisk (som i uden at hårdkode alle databasenavne på forhånd) uden dynamisk SQL, og du kan ikke bruge dynamisk SQL i en funktion. Du bør under ingen omstændigheder bruge sp_MSForEachDB eller, IMHO, ved at bruge INFORMATION_SCHEMA .

Skriv en lagret procedure, der returnerer resultatsættet. Hvis du absolut har brug for at forbinde outputtet med andre ting (hvorfor ikke kode det i den lagrede procedure?), så indsæt outputtet i en #temp-tabel.

Prøv dette:

CREATE PROCEDURE dbo.AllMyColumnsEverywhereForReals
AS
BEGIN
  SET NOCOUNT ON;

  DECLARE @sql NVARCHAR(MAX) = N'';

  SELECT @sql += '
  UNION ALL SELECT 
      [database]  = N''' + d.name + ''' COLLATE SQL_Latin1_General_CP1_CI_AI,
      [schema]    = s.name COLLATE SQL_Latin1_General_CP1_CI_AI,
      [object]    = o.name COLLATE SQL_Latin1_General_CP1_CI_AI,
      [column]    = c.name COLLATE SQL_Latin1_General_CP1_CI_AI,
      [qualified] = QUOTENAME(''' + d.name + ''') 
        + ''.'' + QUOTENAME(s.name) 
        + ''.'' + QUOTENAME(c.name) COLLATE SQL_Latin1_General_CP1_CI_AS,
      [type] = CASE o.type WHEN ''U'' THEN ''Table'' ELSE ''View'' END
    FROM ' + QUOTENAME(d.name) + '.sys.columns AS c
      INNER JOIN ' + QUOTENAME(d.name) + '.sys.objects AS o
      ON c.[object_id] = o.[object_id]
      INNER JOIN ' + QUOTENAME(d.name) + '.sys.schemas AS s
      ON o.[schema_id] = s.[schema_id]
      WHERE o.type IN (''U'', ''V'')'
  FROM sys.databases AS d WHERE [state] = 0 AND name NOT IN 
    (N'master',N'tempdb',N'msdb',N'model',N'ReportServer',N'ReportServerTempDB');

  SET @sql = STUFF(@sql, 1, 13, '');

  EXEC sp_executesql @sql;
END
GO

Brug:

CREATE TABLE #x
(
  db     SYSNAME, 
  sch    SYSNAME, 
  obj    SYSNAME, 
  col    SYSNAME, 
  qual   NVARCHAR(390),
  [type] CHAR(5)
);

INSERT #x EXEC dbo.AllMyColumnsEverywhereForReals;

SELECT cols FROM #x AS x -- INNER JOIN something else ON x.whatever...