mysql - 理解全文 bool 模式结果

Question

我一直在使用 MySQL 的全文搜索的 bool 模式，但我不理解有时得到的结果。

例如，这里是一些数据行..

auction_id,'name'
100543,'2011-12 Fleer Retro patch auto'
100544,'2011-12 Fleer Retro patch auto jordan'
100545,'2011-12 Fleer Retro autograph'
100546,'2011-12 Fleer Retro autographed'
100547,'2011-12 Fleer Retro auto'
100549,'1999 jordan auto'
100550,'1999 auto jordan'
100551,'1999 autograph jordan'
100552,'1999 autographed jordan patch'
100553,'1999 jordan non auto'

现在，如果我运行查询:

SELECT auction_id,NAME,description FROM auctions WHERE MATCH(`name`) AGAINST('+jordan +auto' IN BOOLEAN MODE);

我得到了返回的行100544,100549,100550,100553，这是正确的。但是，如果我运行此查询:

SELECT auction_id,NAME,description FROM auctions WHERE MATCH(`name`) AGAINST('+jordan +auto -non' IN BOOLEAN MODE);

我得到了相同的返回结果； 100553 不应该消失吗，因为它的 name 中有“non”？

另外，如果我将其更改为:

SELECT auction_id,NAME,description FROM auctions WHERE MATCH(`name`) AGAINST('+jordan +auto -"non auto"' IN BOOLEAN MODE);

我没有收到返回的结果；我应该把除了 100553 之外的所有内容都获取吗？

Answer 1

如 Boolean Full-Text Searches 下所述:

Boolean full-text searches have these characteristics:

[ deletia ]

• The minimum and maximum word length full-text parameters apply: innodb_ft_min_token_size and innodb_ft_max_token_size for InnoDB search indexes, and ft_min_word_len and ft_max_word_len for MyISAM ones.

如 Natural Language Full-Text Searches 下所述:

Some words are ignored in full-text searches:

• Any word that is too short is ignored. The default minimum length of words that are found by full-text searches is three characters for InnoDB search indexes, or four characters for MyISAM. You can control the cutoff by setting a configuration option before creating the index: innodb_ft_min_token_size configuration option for InnoDB search indexes, or ft_min_word_len for MyISAM.