匹配两个表中的记录 [英] Matching records from two tables

问题描述

我有两个表:ads_info和ads.

I have two Tables: ads_info and ads.

我想匹配两个表中的记录.

I want to match records from two tables.

广告的SQL模式:

| id |                 title |
|----|-----------------------|
|  1 | This Dog is very nice |

ads_info的SQL架构:

SQL Schema for ads_info:

| id |                     infotext |       tag |
|----|------------------------------|-----------|
|  1 | Dogs can eat a lot of things | dog, pets |

我想检查ID为1的广告的标题中ads_info中是否有标签.我已经尝试过了:

I want to check if the title of the Ads with id 1 has tags in ads_info. I have tried this:

SELECT * FROM `ads` where id = '1' UNION
SELECT * FROM `ads_info` where tag like '%ads.title%'

此处是SQL字段: LINK

推荐答案

您可以这样操作:演示我确信有更好的方法，甚至可以更好地执行此示例:)但这可能会有所帮助...

Well you can do it this way : DEMO I am sure there are better ways and even this example can be better executed :) But it will maybe help...

首先您要创建拆分功能和在表中插入这些值的过程(我在这里使用此处的答案

First you create function for split and procedure for inserting those values in table(I have used here a answer from here LINK and corrected some small errors):

功能

CREATE FUNCTION SPLIT_STR(
  x VARCHAR(255),
  delim VARCHAR(12),
  pos INT
)
RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
       LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
       delim, '');

过程

CREATE PROCEDURE ABC(in fullstr VARCHAR(255))

BEGIN

DECLARE a int default 0;
DECLARE str VARCHAR(255);

      simple_loop: LOOP
         SET a=a+1;
         SET str=SPLIT_STR(fullstr,",",a);
         IF str='' THEN
            LEAVE simple_loop;
         END IF;

         insert into my_temp_table values (str);
      END LOOP simple_loop;
END;

我已经为此值创建了一个表:

I have created a table for this values:

create table my_temp_table (temp_columns varchar(100));

调用了该过程:

 call ABC((select tag from ads_info));

然后您可以使用它:

Select * from ads B where exists
(select * from my_temp_table where 
find_in_set(UPPER(trim(temp_columns)), replace(UPPER(B.TITLE), ' ', ',')) > 0 );

或者这个:

SELECT * FROM ads, my_temp_table
WHERE find_in_set(UPPER(trim(temp_columns)), replace(UPPER(ads.TITLE), ' ', ',')) > 0 ;

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