MySQL搜索(按相关性排序)

Question

任何人都可以帮助我按照以下标准按相关性排序行吗？

`tbluser`
- - - - - - -
First Name
Last Name

`tbleduc`
- - - - - - -
School
College
University

在搜索表单上,用户具有以下字段

Name
School
College
University

学院和大学可选的地方..

并且Name被分成2个单词(中间的其他单词被省略),第一个单词被视为第一个anme而最后一个单词被作为姓氏.

现在我想基于相关性实现搜索.

谢谢您的帮助 :)

Answer 1

好的,我在Postgres上为你试过这个(我这里没有MySQL,所以也许它有点不同):

select matches.id,
      (matches.tfirstname
       + matches.tlastname 
       + matches.tschool
       + matches.tcollege
       + matches.tuniversity) as total
from (
   select u.id,
          (case when u.firstname like '%a%' then 1 else 0 end) as tfirstname,
          (case when u.lastname like '%b%' then 1 else 0 end) as tlastname,
          sum(e2.nschool) as tschool,
          sum(e2.ncollege) as tcollege,
          sum(e2.nuniversity) as tuniversity
   from tbluser u left outer join (
      select e.usr,
             (case when e.school like '%c%' then 1 else 0 end) as nschool,
             (case when e.college like '%d%' then 1 else 0 end) as ncollege,
             (case when e.university like '%e%' then 1 else 0 end) as nuniversity
      from tbleduc e
   ) e2 on u.id=e2.usr
   group by u.id, u.firstname, u.lastname
) as matches

我使用这些DDL语句来创建表:

create table tbluser (
  id int primary key,
  firstname varchar(255),
  lastname varchar(255)
)


create table tbleduc (
  id int primary key,
  usr int references tbluser,
  school varchar(255),
  college varchar(255),
  university varchar(255)
)

还有一些示例数据:

insert into tbluser(id, firstname, lastname)
            values (1, 'Jason', 'Bourne');
insert into tbleduc(id, usr, school, college, university)
            values (1, 1, 'SomeSchool', 'SomeCollege', 'SomeUniversity');
insert into tbleduc(id, usr, school, college, university)
            values (2, 1, 'MoreSchool', 'MoreCollege', 'MoreUniversity');

该查询可被简化了一下,如果之间的关系tbluser和tbleduc为1:1.

不要忘了更换%a%,%b你的变量,......(我建议使用事先准备好的声明).

我希望这个模板有助于作为一个基本的解决方案 - 你可以随意调整它:-)你也可以删除最外面的select语句,以获得各个结果的计数器.