Use group by to solve the problem of querying from and from multiple tables in MySQL

How can I solve the problem of restoring MySQL multi-join table queries? The following describes how to solve the problem of restoring MySQL multi-join table queries. We hope this will help you learn MySQL multi-join table queries.

------------------------------------- Group by solution --------------------------------------

 
 

  
  
SELECT dede_addonarticle.aid, dede_addonarticle.typeid,  
  
  
 
  
  
dede_addonarticle.body,dede_archives.typeid,dede_archives.title  
  
  
FROM dede_addonarticle,dede_archives  
  
  
WHERE dede_addonarticle.typeid = 29 and dede_addonarticle.typeid = dede_archives.typeid  
  
  
 
 
 

As in the preceding query method, the nth power of the slave node appears.

Bytes -------------------------------------------------------------------------------------------------

 
 

  
  
SELECT dede_addonarticle.aid, dede_addonarticle.typeid, dede_addonarticle.body,dede_archives.typeid,dede_archives.title  
  
  
FROM dede_addonarticle,dede_archives   
  
  
where dede_addonarticle.typeid = 29 
  
  
GROUP BY dede_addonarticle.aid  
  
  
 
 
 

Group by can solve the problem of auto-recovery. dede_addonarticle.aid is where the auto-recovery occurs.
 

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