Question

I have 2 tables :

tb_doc :

===========================================
| id | document_title | document_summary  |
===========================================
| 1  | a data mining  | document_summary1 |
| 2  | B              | document_summary2 |
===========================================  

tb_wrap :

============================================
| id | data_url | data_title    | doc_url  |
===========================================
| 1  |data_url1 | B             | doc_url1 |
| 2  |data_url2 | a data mining | doc_url2 |
============================================

I wanna join data from 2 table where document_title = data_title (match 2 strings), so I will get the result like :

data_title <href data_url>
doc_url
document_summary

here’s the query :

SELECT * from tb_wrap as a 
JOIN (
SELECT document_title, document_summary from tb_doc) as b` 
ON a.data_title LIKE b.document_title

How to get them? thank you 🙂

Answer 1

The JOIN condition should be an = rather than a LIKE. I see no need to join against a subquery. This is just a rudimentary INNER JOIN.

SELECT
  tb_wrap.data_url,
  tb_wrap.data_title
  tb_wrap.doc_url,
  tb_doc.document_summary
FROM 
  tb_doc
  INNER JOIN tb_wrap ON tb_doc.document_title = tb_wrap.data_title