Server VARCHAR不工作的Varbinary -> VARCHAR

Question

嘿，我的解决方案有几个问题，我想不出来

下面是我的创建表

    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表，其中FileExtension为HTML等等。

我已经基于触发器将数据转换为VARBINARY自动插入到表中，但是现在有两个问题

内容如下：

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

将不会被查询检测到，如

    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

会回来

ID: 1 Content <
ID: 2 Content <

而

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

会回来

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>

这是正确的数据，但不清楚为什么

1. FREETEXT没有找到任何
2. 为什么VARCHAR(MAX)只返回<

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;