问题描述
我试图想出一种查询结果集的方法，该方法返回没有关联扩展属性的任何列的架构/表/列，以便我的团队可以了解在哪里添加文档。
话虽如此……是否可以查询没有值的扩展属性？我尝试了以下操作，并用 p.value = '' 但没有雪茄切换了最后一行。
SELECT
SCHEMA_NAME(tbl.schema_id) AS SchemaName,tbl.name AS TableName,clmns.name AS ColumnName
FROM
sys.tables AS tbl
INNER JOIN sys.all_columns AS clmns ON clmns.object_id=tbl.object_id
INNER JOIN sys.extended_properties AS p ON p.major_id=tbl.object_id
WHERE SCHEMA_NAME(tbl.schema_id) = 'schema_name'
AND tbl.name = 'table_name'
AND p.value is null
解决方法
试试这个：
SELECT
s.[name] AS [schema_name],t.[name] AS [table_name],c.[name] AS [column_name],x.[value] AS [MS_Description]
FROM [sys].[schemas] AS s
INNER JOIN [sys].[tables] AS t
ON s.[schema_id] = t.[schema_id]
INNER JOIN [sys].[columns] AS c
ON t.[object_id] = c.[object_id]
LEFT OUTER JOIN [sys].[extended_properties] AS x
ON t.[object_id] = x.[major_id]
AND c.[column_id] = x.[minor_id]
AND x.[name] = 'MS_Description'
WHERE
t.[name] = 'your_table_name'
AND s.[name] = 'your_schema_name';
样本结果集：
+-------------+------------+----------------+-------------------------+
| schema_name | table_name | column_name | MS_Description |
+-------------+------------+----------------+-------------------------+
| dbo | tblClients | pk_ClientID | NULL |
| dbo | tblClients | ClientName | Client's business name. |
| dbo | tblClients | PrimaryContact | NULL |
| dbo | tblClients | Addr | NULL |
| dbo | tblClients | Addr2 | NULL |
| dbo | tblClients | Addr3 | NULL |
| dbo | tblClients | City | NULL |
| dbo | tblClients | State | NULL |
| dbo | tblClients | Zipcode | NULL |
| dbo | tblClients | Phone | NULL |
+-------------+------------+----------------+-------------------------+