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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 OSX

locale::codes::langext

Locale::Codes::LangExt(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangExt(3pm)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11					       Locale::Codes::LangExt(3pm)
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