MySQL 5.1 Reference Manual 中有详细说明 把英文自动翻译一下看看吧[align=center]====思想重于技巧==== [/align]
解释：A boolean search interprets the search string using the rules of a special query language. The string contains the words to search for. It can also contain operators that specify requirements such that a word must be present or absent in matching rows, or that it should be weighted higher or lower than usual. Common words such as “some” or “then” are stopwords and do not match if present in the search string. The IN BOOLEAN MODE modifier specifies a boolean search. For more information, see Section 11.8.1, “Boolean Full-Text Searches”. A natural language search interprets the search string as a phrase in natural human language (a phrase in free text). There are no special operators. The stopword list applies. In addition, words that are present in 50% or more of the rows are considered common and do not match. Full-text searches are natural language searches if no modifier is given. A query expansion search is a modification of a natural language search. The search string is used to perform a natural language search. Then words from the most relevant rows returned by the search are added to the search string and the search is done again. The query returns the rows from the second search. The WITH QUERY EXPANSION modifier specifies a query expansion search. For more information, see Section 11.8.2, “Full-Text Searches with Query Expansion”.
把英文自动翻译一下看看吧[align=center]==== 思想重于技巧 ====
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