Come elencare il nome della tabella di origine delle colonne in VIEW (SQL Server 2005)

Question

Basta chiedersi come elencare il nome della colonna e il nome della tabella in una query per una vista.

Ad esempio:

Una vista denominata come viewC, creare da tbl1 inner join tbl2, contengono a,b,c,d colonne (a,b da tbl1 e c,d da tbl2).

Come

Select COLUMN_NAME, DATA_TYPE, column_default, character_maximum_length, sourceTableNAME 
FROM information_schema.columns 
where table_name='viewC' 

insieme?

Answer 1

Queste informazioni sono disponibili dai INFORMATION_SCHEMA vista:

SELECT * 
FROM INFORMATION_SCHEMA.VIEW_COLUMN_USAGE AS cu 
JOIN INFORMATION_SCHEMA.COLUMNS AS c 
ON  c.TABLE_SCHEMA = cu.TABLE_SCHEMA 
AND  c.TABLE_CATALOG = cu.TABLE_CATALOG 
AND  c.TABLE_NAME = cu.TABLE_NAME 
AND  c.COLUMN_NAME = cu.COLUMN_NAME 
WHERE cu.VIEW_NAME = '<your view name>' 
AND  cu.VIEW_SCHEMA = '<your view schema>' 

Se la vista include le tabelle da più di un database, la query diventerà considerevolmente più complesso

Answer 2

Prova questo:

SELECT * FROM INFORMATION_SCHEMA.VIEW_COLUMN_USAGE AS VCU 
JOIN INFORMATION_SCHEMA.COLUMNS AS COL 
ON COL.TABLE_SCHEMA = VCU.TABLE_SCHEMA 
AND COL.TABLE_CATALOG = VCU.TABLE_CATALOG 
AND COL.TABLE_NAME = VCU.TABLE_NAME 
AND COL.COLUMN_NAME = VCU.COLUMN_NAME 
WHERE VCU.VIEW_NAME = 'ViewName' 

See this SQLFiddle

Answer 3

Avevo una vista (SQL Server 2012) che legge da un altro database e aveva anche un UNION. Le query precedenti non hanno funzionato per me, quindi ho deciso di utilizzare il Profiler per verificare come SSMS avrebbe recuperato le informazioni. Questo è quello che ho trovato:

SELECT 
    clmns.name AS [Name] 
    ,usrt.name AS [DataType] 
    ,CAST(CASE WHEN baset.name IN (N'nchar', N'nvarchar') AND clmns.max_length <> -1 THEN clmns.max_length/2 ELSE clmns.max_length END AS int) AS [Length] 
    ,CAST(clmns.precision AS int) AS [NumericPrecision] 
    ,CAST(clmns.scale AS int) AS [NumericScale] 
    ,clmns.column_id AS [ID] 
FROM sys.all_views AS v 
INNER JOIN sys.all_columns AS clmns 
    ON clmns.object_id=v.object_id 
LEFT OUTER JOIN sys.indexes AS ik 
    ON ik.object_id = clmns.object_id 
    AND 1=ik.is_primary_key 
LEFT OUTER JOIN sys.types AS usrt 
    ON usrt.user_type_id = clmns.user_type_id 
LEFT OUTER JOIN sys.types AS baset 
    ON (baset.user_type_id = clmns.system_type_id AND baset.user_type_id = baset.system_type_id) 
    OR ((baset.system_type_id = clmns.system_type_id) AND (baset.user_type_id = clmns.user_type_id) AND (baset.is_user_defined = 0) AND (baset.is_assembly_type = 1)) 
LEFT OUTER JOIN sys.xml_schema_collections AS xscclmns 
    ON xscclmns.xml_collection_id = clmns.xml_collection_id 
WHERE v.[type] = 'V' 
    AND v.name ='<your view name>' 
    AND SCHEMA_NAME(v.schema_id)='<your schema name>' 
ORDER BY [ID] ASC