Question

我正在尝试搜索整个表格，并在长字符串中返回最常出现的短语（最多三个单词）。我相信我可以使用全文搜索，但我不能匹配任何东西......

表

I like Iron Man 3 so much
Iron Man 3 sucked alot
Iron Man really saved the day
I like cats
cats are cool

结果

Iron Man
Iron Man 3
cats

查询

SELECT *
    FROM table
    WHERE substring(text, up to 3 words) OCCURS MOST
    ORDER BY OCCURRENCE DESC

Answer 1

如果你真的是这样，我会说你应该把文本（非sql）解析成一个名为word_list的表，比如

create table phrases (word1 varchar, word2 varchar, word3 varchar, cnt int);

和代码：

$q = query("select comment from comments");
while ($row = array_read_line($q)){

$words = preg_split('/\s/', $row['comment']);
$previous1 = false;
$previous2 = false;

foreach($words as $word){
     if($previous1 and $previous2){
        .. here comes quoting, security, mysql-injection-safety, min length
        query("update relations set cnt = cnt+1 "
            . " where word1 = '$previous1', word2 = '$previous2', word3='$word'" ) 
        if (rows_afected == 0){
            query("insert into relations "
            . " set cnt = 1, word1 = '$previous1', "
            . " word2 = '$previous2', word3='$word'" ) 
        }
    }
    previous1 = $previous2;
    $previous2 = $word;
}

}

然后按照计数命令。

在MySQL中搜索大多数短语

1 个答案: