Microsoft SQL Server full-text Indexing Service

Full-Text Search for SQL 7 is very similar to the Index Server retrieval method.

Contains

And, or, not

Logical expressions can be easily used in contains

Example:

Select username from member where contains (UserInfo, ' "Writer" and "Carpenter")

Select username from member where contains (UserInfo, ' "Writer" OR "Carpenter")

Select username from member where contains (UserInfo, ' "Writer" and not "Carpenter")

NEAR

This is a keyword that is not in the normal logical expression, meaning it is very simple, that is to find the nearest two words

Example:

Select content from Microsoftrecord where contains (content, ' Bill Gates ')
NEAR "Paul Allen")

This means finding the full text containing Bill Gates and Paul Allen, and two words are not far apart.

Formsof inflectional

This function can look up various forms of words, such as past tense, plural, verb form, noun form, etc. But it's no use to Chinese.

Example:

SELECT ProductName from the products WHERE CONTAINS (ProductName, ' formsof (inflectional, dry) ')

*

This feature can look up the prefix of a word, but it is not useful for Chinese

Example:

SELECT ProductName from the products WHERE CONTAINS (ProductName, ' dis* ')

Isabout WEIGHT

This feature can give different weights to different conditions in a composite query to determine the order of the returned recordset

SELECT CategoryName, Description from Categories WHERE CONTAINS (Description, ' isabout
Spread weight (. 8), sauces weight (. 4), relishes weight (. 2))

The value of the weight can be from 0.0 to 1.0

ContainsTable

It is used in the same way as contains, and this is no longer repeated here. To mention is that it returns a table for you to query further, not a query condition.

FreeText

If you use this method, then the query will use the word segmentation technology to achieve fuzzy query, and filter out some non-keywords, more similar to the contains in the formsof, but there is no support for Chinese

Example:

SELECT CategoryName from Categories WHERE FREETEXT (Description, ' sweetest candy, bread and
Dry meat ')

Freetexttable

The difference between it and FREETEXT is the same as that of contains and containstable.