本文IT技术学习网将给大家讲述什么是mysql全文索引中的停止词（stopword也有的翻译做停止字）。

stopword

在全文索引中，如果一个词被认为是太普通或者太没价值，那么它将会被搜索索引和搜索查询忽略。innodb和myisam分别有两组不同的设置，控制着对应的stopword。

全文检索时，停止词列表将会被读取和检索，在不同的字符集和排序方式下（character_set_server and collation_server 系统变量），可能会导致在搜索时的停止词的不匹配。

停止词是否大小写敏感，取决于不同的排序方式，比如：latin1_swedish_ci下停止词是大小写敏感的，latin1_general_cs 或 latin1_bin下停止词是大小写不敏感的。

innodb的索引停止词

innodb的默认停止词列表很短。查询INFORMATION_SCHEMA.INNODB_FT_DEFAULT_STOPWORD表来查看默认的innodb停止词表。

mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_FT_DEFAULT_STOPWORD;

+-------+

| value |

+-------+

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| a     |

| about |

| an    |

| are   |

| as    |

| at    |

| be    |

| by    |

| com   |

| de    |

| en    |

| for   |

| from  |

| how   |

| i     |

| in    |

| is    |

| it    |

| la    |

| of    |

| on    |

| or    |

| that  |

| the   |

| this  |

| to    |

| was   |

| what  |

| when  |

| where |

| who   |

| will  |

| with  |

| und   |

| the   |

| www   |

+-------+

36 rows in set (0.00 sec)

myisam索引的停止词

myisam索引的停止词列表与innodb不同，默认的myisam停止词列表是直接在mysql程序源码中已写入。设置ft_stopword_file系统变量来指定停止词文件，从而覆盖默认设置。

在mysql源程序的 storage/myisam/ft_static.c file文件中，你可以找到默认的myisam停止词列表：

a's able about above according

accordingly across actually after afterwards

again against ain't all allow

allows almost alone along already

also although always am among

amongst an and another any

anybody anyhow anyone anything anyway

anyways anywhere apart appear appreciate

appropriate are aren't around as

aside ask asking associated at

available away awfully be became

because become becomes becoming been

before beforehand behind being believe

below beside besides best better

between beyond both brief but

by c'mon c's came can

can't cannot cant cause causes

certain certainly changes clearly co

com come comes concerning consequently

consider considering contain containing contains

corresponding could couldn't course currently

definitely described despite did didn't

different do does doesn't doing

don't done down downwards during

each edu eg eight either

else elsewhere enough entirely especially

et etc even ever every

everybody everyone everything everywhere ex

exactly example except far few

fifth first five followed following

follows for former formerly forth

four from further furthermore get

gets getting given gives go

goes going gone got gotten

greetings had hadn't happens hardly

has hasn't have haven't having

he he's hello help hence

her here here's hereafter hereby

herein hereupon hers herself hi

him himself his hither hopefully

how howbeit however i'd i'll

i'm i've ie if ignored

immediate in inasmuch inc indeed

indicate indicated indicates inner insofar

instead into inward is isn't

it it'd it'll it's its

itself just keep keeps kept

know known knows last lately

later latter latterly least less

lest let let's like liked

likely little look looking looks

ltd mainly many may maybe

me mean meanwhile merely might

more moreover most mostly much

must my myself name namely

nd near nearly necessary need

needs neither never nevertheless new

next nine no nobody non

none noone nor normally not

nothing novel now nowhere obviously

of off often oh ok

okay old on once one

ones only onto or other

others otherwise ought our ours

ourselves out outside over overall

own particular particularly per perhaps

placed please plus possible presumably

probably provides que quite qv

rather rd re really reasonably

regarding regardless regards relatively respectively

right said same saw say

saying says second secondly see

seeing seem seemed seeming seems

seen self selves sensible sent

serious seriously seven several shall

she should shouldn't since six

so some somebody somehow someone

something sometime sometimes somewhat somewhere

soon sorry specified specify specifying

still sub such sup sure

t's take taken tell tends

th than thank thanks thanx

that that's thats the their

theirs them themselves then thence

there there's thereafter thereby therefore

therein theres thereupon these they

they'd they'll they're they've think

third this thorough thoroughly those

though three through throughout thru

thus to together too took

toward towards tried tries truly

try trying twice two un

under unfortunately unless unlikely until

unto up upon us use

used useful uses using usually

value various very via viz

vs want wants was wasn't

way we we'd we'll we're

we've welcome well went were

weren't what what's whatever when

whence whenever where where's whereafter

whereas whereby wherein whereupon wherever

whether which while whither who

who's whoever whole whom whose

why will willing wish with

within without won't wonder would

wouldn't yes yet you you'd

you'll you're you've your yours

yourself yourselves zero