如何在MySQL中找到最流行的单词出现? [英] How to find most popular word occurrences in MySQL?

问题描述

我有一个名为results的表，该表有5列.

I have a table called results with 5 columns.

我想使用title列查找表示以下内容的行:WHERE title like '%for sale%'，然后在该列中列出最受欢迎的单词.一个是for，另一个是sale，但我想看看与此相关的其他词.

I'd like to use the title column to find rows that are say: WHERE title like '%for sale%' and then listing the most popular words in that column. One would be for and another would be sale but I want to see what other words correlate with this.

样本数据:

title
cheap cars for sale
house for sale
cats and dogs for sale
iphones and androids for sale
cheap phones for sale
house furniture for sale

结果(单字):

for    6
sale    6
cheap    2
and    2
house    2
furniture 1
cars    1
etc...

推荐答案

您可以通过一些字符串操作来提取单词.假设您有一个数字表，并且单词之间用单个空格隔开:

You can extract words with some string manipulation. Assuming you have a numbers table and that words are separated by single spaces:

select substring_index(substring_index(r.title, ' ', n.n), ' ', -1) as word,
       count(*)
from results r join
     numbers n
     on n.n <= length(title) - length(replace(title, ' ', '')) + 1
group by word;

如果没有数字表，则可以使用子查询手动构造一个数字表:

If you don't have a numbers table, you can construct one manually using a subquery:

from results r join
     (select 1 as n union all select 2 union all select 3 union all . . .
     ) n
     . . .

SQL提琴(由@GrzegorzAdamKowalski提供)是此处.

The SQL Fiddle (courtesy of @GrzegorzAdamKowalski) is here.

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