SQL 服务器自由文本 Varbinary returns 没有，转换 VARBINARY -> VARCHAR 不工作

Question

嘿，我的解决方案有一些问题，我想不出来

下面是我的创作table

    CREATE TABLE FreeTextSearch
(
    [ID] BIGINT NOT NULL IDENTITY(1,1),
    [Content] VARBINARY(MAX) NOT NULL,
    [SubjectClass] VARCHAR(30) NOT NULL,
    [SubjectID] VARCHAR(30) NOT NULL,
    [ColumnName] VARCHAR(128) NOT NULL,
    CONSTRAINT PK_FreeTextSearch PRIMARY KEY (ID)
);


ALTER TABLE FreeTextSearch
Add FileExtension As '.html';

CREATE INDEX FreeTextSearch_SubjectClass
ON FreeTextSearch ([SubjectClass]); 


CREATE FULLTEXT CATALOG [freetext_catalog]


CREATE FULLTEXT INDEX ON FreeTextSearch
(
    [Content] TYPE COLUMN FileExtension
)
    KEY INDEX PK_FreeTextSearch ON freetext_catalog;

这将创建一个 FreeTextSearch table，FileExtension 为 HTML 等

我已经根据触发器自动将数据转换为 VARBINARY 插入到 table 中，但现在有两个问题

内容如：

<p>Test note for free text bla!</p>

不会被像

这样的查询检测到

    SELECT
    Id,
    CONVERT(VARCHAR(MAX), [Content]) AS [Content]
FROM dbo.FreeTextSearch
WHERE FREETEXT ([Content], 'Test')

另外

    SELECT
    Id,
    CONVERT(VARCHAR(MAX), [Content]) AS [Content]
FROM dbo.FreeTextSearch

会 return

ID: 1 Content <
ID: 2 Content <

同时

    SELECT
    Id,
    CONVERT(XML, [Content]) AS [Content]
FROM dbo.FreeTextSearch

会Return

ID: 1 Content: <p>Test note for free text bla!</p>
ID: 2 Content: <p>Something is very wrong with this one i think</p><p>Not really sure what.</p>

哪个数据是正确的，但不清楚原因

FREETEXT 没有找到任何东西
为什么只有 VARCHAR(MAX) returns <

Answer 1

select test, cast(test as varchar(max)), cast(test as nvarchar(max))
from
(
select cast('a' as varbinary(max)) + 0x0 /* nul in ascii, anything after that not printed*/ + cast('123' as varbinary(max)) as test
) as src;


select test, cast(test as varchar(max)), cast(test as nvarchar(max))
from
(
select cast(N'<p>Test note for free text bla!</p>' as varbinary(max)) as test
) as src;

SQL 服务器自由文本 Varbinary returns 没有，转换 VARBINARY -> VARCHAR 不工作

SQL Server Freetext Varbinary returns nothing and Conversion VARBINARY -> VARCHAR Not working

sql

sql-server

type-conversion

freetext

freetexttable