Ask for a SQL discourse.

To find an SQL statement:
Thought for a long time, there is no clue how to write.
I want to query the three tables of Discuz X2.0, respectively, the Pre_forum_thread,pre_forum_attachment Index table, Pre_forum_attachment_n's child table

SQL Code

  CREATE TABLE IF not EXISTS ' pre_forum_thread ' (' Tid ' mediumint (8) unsigned not NULL auto_increment, ' FID ' mediumint (8) unsigned NOT NULL default ' 0 ', ' posttableid ' smallint (6) unsigned NOT null default ' 0 ', ' typeid ' smallint (6) unsigned NO T null default ' 0 ', ' sortid ' smallint (6) unsigned NOT null default ' 0 ', ' readperm ' tinyint (3) unsigned NOT NULL default ' 0 ', ' Price ' smallint (6) is not null default ' 0 ', ' author ' char (all) NOT null default ' ', ' Authorid ' mediumint (8) unsigned Not null default ' 0 ', ' subject ' char (+) NOT null default ' ', ' Dateline ' int (ten) unsigned NOT null default ' 0 ', ' lastpo St ' int (ten) unsigned NOT null default ' 0 ', ' lastposter ' char (+) NOT null default ' ', ' views ' int (ten) unsigned NOT NULL Default ' 0 ', ' replies ' Mediumint (8) unsigned NOT NULL default ' 0 ', ' displayorder ' tinyint (1) NOT null default ' 0 ', ' hig Hlight ' tinyint (1) NOT null default ' 0 ', ' Digest ' tinyint (1) is not null default ' 0 ', ' rate ' tinyint (1) is not null default ' 0 ', ' Special ' tinyint (1) Not null default ' 0 ', ' attachment ' tinyint (1) is not NULL for default ' 0 ', ' moderated ' tinyint (1) NOT null default ' 0 ', ' Clos Ed ' Mediumint (8) unsigned NOT NULL default ' 0 ', ' stickreply ' tinyint (1) unsigned NOT null default ' 0 ', ' recommends ' smal Lint (6) NOT null default ' 0 ', ' recommend_add ' smallint (6) is not null default ' 0 ', ' recommend_sub ' smallint (6) is not NULL DEF Ault ' 0 ', ' heats ' int (ten) unsigned NOT null default ' 0 ', ' status ' smallint (6) unsigned NOT null default ' 0 ', ' isgroup ' tinyint (1) NOT null default ' 0 ', ' favtimes ' Mediumint (8) is not null default ' 0 ', ' sharetimes ' Mediumint (8) is not NULL Defaul T ' 0 ', ' Stamp ' tinyint (3) NOT NULL default '-1 ', ' Icon ' tinyint (3) NOT NULL default '-1 ', ' Pushedaid ' mediumint (8) not  Null default ' 0 ', ' cover ' smallint (6) NOT null default ' 0 ', ' replycredit ' smallint (6) NOT null default ' 0 ', PRIMARY KEY (' Tid '), Key ' Digest ' (' Digest '), key ' SortID ' (' SortID '), key ' Displayorder ' (' fid ', ' displayorder ', ' lastpost '), key ' typeID ' (' fid ', ' typeid '), ' Displayorder ', ' lastpost '), key ' recommends ' (' recommends '), key ' heats ' (' heats '), key ' Authorid ' (' Authorid '), key ' Isgroup ' (' Isgroup ', ' lastpost '), KEY ' Special ' (' Special ')) Engine=myisam DEFAULT Charset=utf8 auto_increment=380;

The pre_forum_attachment structure is as follows:

SQL Code

  
   CREATE TABLE IF not EXISTS ' pre_forum_attachment ' (  ' aid ' mediumint (8) unsigned not NULL auto_increment,  ' tid ' med Iumint (8) unsigned NOT NULL default ' 0 ',  ' pid ' int (ten) unsigned NOT null default ' 0 ',  ' uid ' mediumint (8) unsigned Not NULL for default ' 0 ',  ' tableid ' tinyint (1) unsigned NOT NULL for default ' 0 ',  ' Downloads ' Mediumint (8) NOT NULL Defaul T ' 0 ',  PRIMARY key (' aid '),  key ' tid ' (' tid '),  key ' pid ' (' pid '),  key ' uid ' (' uid ')) engine=myisam< C13/>default Charset=utf8 auto_increment=110;

The Pre_forum_attachment_n child table structure is as follows

SQL Code

  CREATE TABLE IF not EXISTS ' pre_forum_attachment_0 ' (' Aid ' mediumint (8) unsigned not NULL, ' tid ' mediumint (8) unsigned Not null default ' 0 ', ' pid ' int (ten) unsigned NOT null default ' 0 ', ' uid ' mediumint (8) unsigned NOT NULL default ' 0 ', ' d  Ateline ' int (ten) unsigned NOT null default ' 0 ', ' filename ' varchar (255) is not null default ' ', ' filesize ' int (ten) unsigned   Not null default ' 0 ', ' attachment ' varchar (255) is not null default ' ', ' Remote ' tinyint (1) unsigned NOT null default ' 0 ',  ' Description ' varchar (255) NOT NULL, ' readperm ' tinyint (3) unsigned not null DEFAULT ' 0 ', ' Price ' smallint (6) unsigned Not NULL for default ' 0 ', ' isimage ' tinyint (1) NOT NULL for default ' 0 ', ' width ' smallint (6) unsigned NOT null default ' 0 ', ' t Humb ' tinyint (1) unsigned NOT null default ' 0 ', ' picid ' Mediumint (8) is not null default ' 0 ', PRIMARY key (' aid '), key ' Ti d ' (' tid '), key ' pid ' (' pid '), Key ' uid ' (' uid ')) Engine=myisam DEFAULT Charset=utf8;
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