semanticsimilaritydetailstable (Transact-SQL)semanticsimilaritydetailstable (Transact-SQL)

• 06/10/2016
• • 
  • 

适用对象： SQL Server Azure SQL 数据库 Azure Synapse Analytics (SQL DW) 并行数据仓库 APPLIES TO: SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data Warehouse

返回一个表，该表包含其内容在语义上相似的两个文档（源文档和匹配的文档）共有的关键短语的零个、一个或多个行。Returns a table of zero, one, or more rows of key phrases that are common across two documents (a source document and a matched document) whose content is semantically similar.

可以在 SELECT 语句的 FROM 子句中引用此行集函数This rowset function can be referenced in the FROM clause of a SELECT statement

TRANSACT-SQL 语法约定 Transact-SQL Syntax Conventions

语法Syntax

SEMANTICSIMILARITYDETAILSTABLE  
    (  
    table,  
    source_column,  
    source_key,  
    matched_column,  
    matched_key  
    )  

参数Arguments

tabletable
启用全文和语义索引的表的名称。Is the name of a table that has full-text and semantic indexing enabled.

此名称可由 1 到 4 个部分组成，但不允许使用远程服务器名称。This name can be a one to four part name, but a remote server name is not allowed.

source_columnsource_column
源行中包含要比较相似性的内容的列的名称。Name of the column in the source row that contains the content to be compared for similarity.

source_keysource_key
表示源文档的行的唯一键。The unique key that represents the row of the source document.

此键将尽可能隐式转换为源表中的全文唯一键的类型。This key is implicitly converted to the type of the full-text unique key in the source table whenever possible. 可以将此键指定为一个常量或变量，但不能是表达式或标量子查询的结果。The key can be specified as a constant or a variable, but cannot be an expression or the result of a scalar sub-query. 如果指定了无效键，则不返回任何行。If an invalid key is specified, no rows are returned.

matched_columnmatched_column
匹配的行中包含要比较相似性的内容的列的名称。Name of the column in the matched row that contains the content to be compared for similarity.

matched_keymatched_key
表示匹配文档的行的唯一键。The unique key that represents the row of the matched document.

此键将尽可能隐式转换为源表中的全文唯一键的类型。This key is implicitly converted to the type of the full-text unique key in the source table whenever possible. 可以将此键指定为一个常量或变量，但不能是表达式或标量子查询的结果。The key can be specified as a constant or a variable, but cannot be an expression or the result of a scalar sub-query.

返回的表Table Returned

下表介绍此行集函数返回的关键短语的信息。The following table describes the information about key phrases that this rowset function returns.

一般备注General Remarks

有关详细信息，请参阅查找相似和相关文档使用语义搜索。For more information, see Find Similar and Related Documents with Semantic Search.

元数据Metadata

有关语义相似性的提取和填充的信息和状态，请查询以下动态管理视图：For information and status about semantic similarity extraction and population, query the following dynamic management views:

• sys.dm_db_fts_index_physical_stats (Transact-SQL)sys.dm_db_fts_index_physical_stats (Transact-SQL)

• sys.dm_fts_semantic_similarity_population (Transact-SQL)sys.dm_fts_semantic_similarity_population (Transact-SQL)

安全性Security

权限Permissions

需要对创建全文和语义搜索所基于的基表具有 SELECT 权限。Requires SELECT permissions on the base table on which the full-text and semantic indexes were created.

示例Examples

下面的示例检索具有最高的相似性得分中指定候选人间的 5 个关键短语HumanResources.JobCandidate AdventureWorks2012 示例数据库的表。The following example retrieves the 5 key phrases that had the highest similarity score between the specified candidates in HumanResources.JobCandidate table of the AdventureWorks2012 sample database. @CandidateId和@MatchedID变量表示全文索引的键列的值。The @CandidateId and @MatchedID variables represent values from the key column of the full-text index.

SELECT TOP(5) KEY_TBL.keyphrase, KEY_TBL.score  
FROMSEMANTICSIMILARITYDETAILSTABLE  
    (  
    HumanResources.JobCandidate,  
    Resume, @CandidateID,  
    Resume, @MatchedID  
    ) AS KEY_TBL  
ORDER BY KEY_TBL.score DESC;