列表和表扩展属性

Question

我想返回数据库中所有表的列表以及该表的任何相关扩展属性。

这给了我表列表：

    SELECT TABLE_NAME AS tTableName, TABLE_TYPE AS tTableType
    FROM information_schema.tables AS t
    WHERE TABLE_TYPE = N'BASE TABLE'
    ORDER BY TABLE_NAME

这为我提供了具有它们的表的扩展属性列表：

    SELECT OBJECT_NAME(ep.major_id) AS [epTableName],
    CAST(ep.Value AS nvarchar(500)) AS [epExtendedProperty]
    FROM sys.extended_properties AS ep
    WHERE ep.name = N'MS_Description' AND ep.minor_id = 0

我看不到如何结合使用这些信息并正确保留WHERE条件。这是错误的，但是它将为您提供有关我哪里出问题的见解：

    SELECT TABLE_NAME AS tTableName, TABLE_TYPE AS tTableType,
    OBJECT_NAME(ep.major_id) AS [epTableName],
    CAST(ep.Value AS nvarchar(500)) AS [epExtendedProperty]
    FROM information_schema.tables AS t
    LEFT OUTER JOIN sys.extended_properties AS ep ON
    t.table_name= OBJECT_NAME(ep.major_id) 
    WHERE TABLE_TYPE = N'BASE TABLE'
    -- No clue where to put this: AND ep.name = N'MS_Description' AND ep.minor_id = 0
    ORDER BY TABLE_NAME

[从Joe在Simon1979的答案下面的评论中添加...

SELECT 
    t.Table_Name, 
    q.epExtendedProperty 
FROM 
    information_schema.tables t 
    LEFT OUTER JOIN 
   (SELECT 
        OBJECT_NAME(ep.major_id) epTableName, 
        CAST(ep.Value AS nvarchar(500)) AS epExtendedProperty 
    FROM 
        sys.extended_properties ep 
    WHERE 
        ep.name = N'MS_Description' AND 
        ep.minor_id = 0) q 
        ON  t.Table_Name = q.epTableName 
WHERE 
    t.Table_Type = N'BASE TABLE' AND 
    t.Table_Name <> 'sysdiagrams' 
ORDER BY 
    q.epExtendedProperty ASC, 
    t.Table_Name ASC 

Answer 1

我认为以下实现了您想要的，尽管我的表上没有任何符合标准的扩展属性，因此很难检查其是否有效：

SELECT TABLE_NAME AS tTableName, 
    TABLE_TYPE AS tTableType,
    q.epTableName,
    q.epExtendedProperty
FROM information_schema.tables AS t
    LEFT OUTER JOIN (SELECT OBJECT_NAME(ep.major_id) AS [epTableName],
        CAST(ep.Value AS nvarchar(500)) AS [epExtendedProperty]
        FROM sys.extended_properties ep
        WHERE ep.name = N'MS_Description' AND ep.minor_id = 0) As q
    ON t.table_name = q.epTableName 
WHERE TABLE_TYPE = N'BASE TABLE'
ORDER BY TABLE_NAME