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Full Discussion: MySQL join four tables!
Top Forums Programming MySQL join four tables! Post 302592391 by yifangt on Monday 23rd of January 2012 05:49:08 PM
Old 01-23-2012
MySQL join four tables!
Hello;
I want merge four MySQL tables to get the intersection that have a common field for all of them. Join two tables is fine to me, but my this case is different from common situations and there are not very many discussions about it. Can anybody give me some idea? Thanks a lot!
Here is part of my simplified tables (out of ~30000 rows per table and more than 10 columns of complicate formats, so that I do not want use shell command JOIN or other want to do the job!):
Code:
TableA:
A1   O
A2   P
A3   Q
A4   R
A5   S
A6   T

TableB:
B1   A1
B2   A2
B3   A3
B4   A4
B5   A1
B6   A2

Table C: 
C1   A1
C2   A2
C3   A2
C4   A4
C5   A4
C6   A1

TableD
D1   A1
D2   A2
D3   A3
D4   A4
D5   A5
D6   A1

The output is expected to be:
Code:
B1   A1   C1   A1   D1   A1   O   
B2   A2   C2   A2   D2   A2   P
B4   A4   C4   A4   D4   A4   R

My Code is:

SELECT
B.ID, B.AGI,
C.ID, C.AGI,
D.ID, D.AGI,
A.ID, A.AGI FROM TableB B, TableC C, TableD D, TableA A WHERE
B.AGI = A.ID
AND C.AGI = A.ID
AND D.AGI = A.ID
AND B.AGI = C.AGI
AND D.AGI = C.AGI
AND B.AGI = D.AGI;

But the output is not what I expected:
Code:
+------+------+------+------+------+------+------+------+
| ID   | AGI  | ID   | AGI  | ID   | AGI  | ID   | AGI  |
+------+------+------+------+------+------+------+------+
| B1   | A1   | C1   | A1   | D1   | A1   | A1   | O    |
| B5   | A1   | C1   | A1   | D1   | A1   | A1   | O    |
| B1   | A1   | C6   | A1   | D1   | A1   | A1   | O    |
| B5   | A1   | C6   | A1   | D1   | A1   | A1   | O    |
| B1   | A1   | C1   | A1   | D6   | A1   | A1   | O    |
| B5   | A1   | C1   | A1   | D6   | A1   | A1   | O    |
| B1   | A1   | C6   | A1   | D6   | A1   | A1   | O    |
| B5   | A1   | C6   | A1   | D6   | A1   | A1   | O    |
| B2   | A2   | C2   | A2   | D2   | A2   | A2   | P    |
| B6   | A2   | C2   | A2   | D2   | A2   | A2   | P    |
| B2   | A2   | C3   | A2   | D2   | A2   | A2   | P    |
| B6   | A2   | C3   | A2   | D2   | A2   | A2   | P    |
| B4   | A4   | C4   | A4   | D4   | A4   | A4   | R    |
| B4   | A4   | C5   | A4   | D4   | A4   | A4   | R    |
+------+------+------+------+------+------+------+------+
14 rows in set (0.00 sec)

Can anybody give me some idea? Got lost with the LEFT/ RIGHT/INNER JOINs. Expert suggestion can save me days of scratch. Thanks a lot!
 

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LEARN ABOUT LINUX

ndb_show_tables

NDB_SHOW_TABLES 					       MySQL Database System						   NDB_SHOW_TABLES

NAME

       ndb_show_tables - display list of NDB tables

SYNOPSIS

       ndb_show_tables [options]

DESCRIPTION

       ndb_show_tables displays a list of all NDB database objects in the cluster. By default, this includes not only both user-created tables and
       NDB system tables, but NDB-specific indexes, internal triggers, and MySQL Cluster Disk Data objects as well.

       The following table includes options that are specific to the MySQL Cluster native backup restoration program ndb_show_tables. Additional
       descriptions follow the table. For options common to most MySQL Cluster programs (including ndb_show_tables), see Options Common to MySQL
       Cluster Programs(1).

       Table 17.26. ndb_show_tables Options and Variables: MySQL Cluster NDB 7.2
       +--------------------------+--------------------------------------+-------------------------------------+
       |Format			  | Description 			 | Added / Removed		       |
       +--------------------------+--------------------------------------+-------------------------------------+
       |			  | Specifies the database in which the  |				       |
       |       --database=string, | table is found			 |	  All MySQL 5.5 based releases |
       |			  |					 |				       |
       |       -d		  |					 |				       |
       +--------------------------+--------------------------------------+-------------------------------------+
       |			  | Number of times to repeat output	 |				       |
       |       --loops=#,	  |					 |	  All MySQL 5.5 based releases |
       |			  |					 |				       |
       |       -l		  |					 |				       |
       +--------------------------+--------------------------------------+-------------------------------------+
       |			  | Limit output to objects of this type |				       |
       |       --type=#,	  |					 |	  All MySQL 5.5 based releases |
       |			  |					 |				       |
       |       -t		  |					 |				       |
       +--------------------------+--------------------------------------+-------------------------------------+
       |			  | Do not qualify table names		 |				       |
       |       --unqualified,	  |					 |	  All MySQL 5.5 based releases |
       |			  |					 |				       |
       |       -u		  |					 |				       |
       +--------------------------+--------------------------------------+-------------------------------------+
       |			  | Return output suitable for MySQL	 |				       |
       |       --parsable,	  | LOAD DATA INFILE statement		 |	  All MySQL 5.5 based releases |
       |			  |					 |				       |
       |       -p		  |					 |				       |
       +--------------------------+--------------------------------------+-------------------------------------+
       |			  | Show table temporary flag		 |				       |
       |       --show-temp-status |					 |	  All MySQL 5.5 based releases |
       +--------------------------+--------------------------------------+-------------------------------------+
	       Usage

	   ndb_show_tables [-c connect_string]

       o   --database, -d

	   Specifies the name of the database in which the tables are found.

       o   --loops, -l

	   Specifies the number of times the utility should execute. This is 1 when this option is not specified, but if you do use the option,
	   you must supply an integer argument for it.

       o   --parsable, -p

	   Using this option causes the output to be in a format suitable for use with LOAD DATA INFILE.

       o   --show-temp-status

	   If specified, this causes temporary tables to be displayed.

       o   --type, -t

	   Can be used to restrict the output to one type of object, specified by an integer type code as shown here:

	   o   1: System table

	   o   2: User-created table

	   o   3: Unique hash index

	   Any other value causes all NDB database objects to be listed (the default).

       o   --unqualified, -u

	   If specified, this causes unqualified object names to be displayed.

	   Note
	   Only user-created MySQL Cluster tables may be accessed from MySQL; system tables such as SYSTAB_0 are not visible to mysqld. However,
	   you can examine the contents of system tables using NDB API applications such as ndb_select_all (see ndb_select_all(1)).

COPYRIGHT

       Copyright (C) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

       This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Oracle Corporation (http://dev.mysql.com/).

MySQL 5.5							    01/30/2014							   NDB_SHOW_TABLES
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