从 SELECT 语句中提取完全限定字段名称的简单方法？

Question

在 SQL Server 中，是否有一种简单的方法可以从 SELECT 语句中输出完全限定的字段名称列表，即使使用别名也是如此？

例如：

SELECT
      a.FieldName1
    , a.FieldName2
    , CASE WHEN a.FieldName9 = 'A' and b.FieldName10 = 'C' Then 'Yes' Else 'No' END as AliasedCase
FROM DatabaseA.dbo.Table1 a
JOIN DatabaseB.dbo.Table2 b on a.FieldName4 = b.FieldName4
WHERE b.FieldName8 Between 1 and 4

输出列表如下所示：

1. DatabaseA.dbo.Table1.FieldName1
2. DatabaseA.dbo.Table1.FieldName2
3. DatabaseA.dbo.Table1.FieldName4
4. DatabaseA.dbo.Table1.FieldName9
5. DatabaseB.dbo.Table2.FieldName4
6. DatabaseB.dbo.Table2.FieldName8
7. DatabaseB.dbo.Table2.FieldName10

Answer 1

您可以使用该SELECT 创建视图或过程，使用sys.dm_sql_referenced_entities 函数获取信息，然后将其删除。

create view dbo.MyTempView
as

SELECT
      a.FieldName1
    , a.FieldName2
    , CASE WHEN a.FieldName9 = 'A' and b.FieldName10 = 'C' Then 'Yes' Else 'No' END as AliasedCase
FROM DatabaseA.dbo.Table1 a
JOIN DatabaseB.dbo.Table2 b on a.FieldName4 = b.FieldName4
WHERE b.FieldName8 Between 1 and 4

select CONCAT(
  dep.referenced_server_name + '.',
  dep.referenced_database_name + '.',
  dep.referenced_schema_name + '.',
  dep.referenced_entity_name + '.',
  dep.referenced_minor_name)
from sys.dm_sql_referenced_entities('dbo.MyTempView', 'OBJECT') dep
where dep.referenced_minor_name is not null;

drop view dbo.MyTempView;

CONCAT 与+ '.' 一起使用意味着空值及其关联的. 将被忽略，因此它只会告诉您您使用的实际引用，它无法确定哪个数据库或架构是如果您未指定，则使用它（由于范围问题，因为它取决于执行时的默认数据库和架构）。

Answer 2

尝试如下：

SELECT 
    c.object_id,
    o.name AS ObjName,
    c.name FieldName,
    c.column_id,
    c.system_type_id,
    c.user_type_id,
    c.max_length,
    c.precision,
    c.scale,
    c.collation_name,
    c.is_nullable,
    c.is_ansi_padded,
    c.is_rowguidcol,
    c.is_identity,
    c.is_computed,
    c.is_filestream,
    c.is_replicated,
    c.is_non_sql_subscribed,
    c.is_merge_published,
    c.is_dts_replicated,
    c.is_xml_document,
    c.xml_collection_id,
    c.default_object_id,
    c.rule_object_id,
    c.is_sparse,
    c.is_column_set,
    c.generated_always_type,
    c.generated_always_type_desc,
    c.encryption_type,
    c.encryption_type_desc,
    c.encryption_algorithm_name,
    c.column_encryption_key_id,
    c.column_encryption_key_database_name,
    c.is_hidden,
    c.is_masked,
    c.graph_type,
    c.graph_type_desc , 
    o.object_id,
    o.principal_id,
    o.schema_id,
    o.parent_object_id,
    o.type,
    o.type_desc,
    o.create_date,
    o.modify_date,
    o.is_ms_shipped,
    o.is_published,
    o.is_schema_published 
FROM 
    sys.all_columns c 
INNER JOIN 
    sys.all_objects o ON o.object_id = c.object_id

通过该查询，您可以获得所有具有数据库列名的表和其他对象。然后就可以随意过滤了。