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Full Discussion: MySQL join four tables!
Top Forums Programming MySQL join four tables! Post 302592441 by durden_tyler on Tuesday 24th of January 2012 12:11:42 AM
Old 01-24-2012
Code:
mysql>
mysql>
mysql> select * from tablea;
+----+-----+
| id | agi |
+----+-----+
| A1 | O   |
| A2 | P   |
| A3 | Q   |
| A4 | R   |
| A5 | S   |
| A6 | T   |
+----+-----+
6 rows in set (0.00 sec)

mysql>
mysql> select * from tableb;
+----+-----+
| id | agi |
+----+-----+
| B1 | A1  |
| B2 | A2  |
| B3 | A3  |
| B4 | A4  |
| B5 | A1  |
| B6 | A2  |
+----+-----+
6 rows in set (0.00 sec)

mysql>
mysql> select * from tablec;
+----+-----+
| id | agi |
+----+-----+
| C1 | A1  |
| C2 | A2  |
| C3 | A2  |
| C4 | A4  |
| C5 | A4  |
| C6 | A1  |
+----+-----+
6 rows in set (0.00 sec)

mysql>
mysql> select * from tabled;
+----+-----+
| id | agi |
+----+-----+
| D1 | A1  |
| D2 | A2  |
| D3 | A3  |
| D4 | A4  |
| D5 | A5  |
| D6 | A1  |
+----+-----+
6 rows in set (0.00 sec)

mysql>
mysql>
mysql> -- query
mysql> select b.id, b.agi,
    ->        c.id, c.agi,
    ->        d.id, d.agi,
    ->        a.agi
    ->   from tablea a,
    ->        (select agi, min(id) as id from tableb group by agi) b,
    ->        (select agi, min(id) as id from tablec group by agi) c,
    ->        (select agi, min(id) as id from tabled group by agi) d
    ->  where a.id = b.agi
    ->    and a.id = c.agi
    ->    and a.id = d.agi;
+------+-----+------+-----+------+-----+-----+
| id   | agi | id   | agi | id   | agi | agi |
+------+-----+------+-----+------+-----+-----+
| B1   | A1  | C1   | A1  | D1   | A1  | O   |
| B2   | A2  | C2   | A2  | D2   | A2  | P   |
| B4   | A4  | C4   | A4  | D4   | A4  | R   |
+------+-----+------+-----+------+-----+-----+
3 rows in set (0.00 sec)

mysql>
mysql>
mysql>

tyler_durden

Last edited by durden_tyler; 01-24-2012 at 09:09 AM..
This User Gave Thanks to durden_tyler For This Post:
 

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CGI::Session::Driver::mysql(3)				User Contributed Perl Documentation			    CGI::Session::Driver::mysql(3)

NAME
CGI::Session::Driver::mysql - CGI::Session driver for MySQL database SYNOPSIS
$s = new CGI::Session( 'driver:mysql', $sid); $s = new CGI::Session( 'driver:mysql', $sid, { DataSource => 'dbi:mysql:test', User => 'sherzodr', Password => 'hello' }); $s = new CGI::Session( 'driver:mysql', $sid, { Handle => $dbh } ); DESCRIPTION
mysql stores session records in a MySQL table. For details see CGI::Session::Driver::DBI, its parent class. It's especially important for the MySQL driver that the session ID column be defined as a primary key, or at least "unique", like this: CREATE TABLE sessions ( id CHAR(32) NOT NULL PRIMARY KEY, a_session TEXT NOT NULL ); To use different column names, change the 'create table' statement, and then simply do this: $s = new CGI::Session('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', DataSource=>'dbi:mysql:project', }); or $s = new CGI::Session('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', Handle=>$dbh, }); DRIVER ARGUMENTS mysql driver supports all the arguments documented in CGI::Session::Driver::DBI. In addition, DataSource argument can optionally leave leading "dbi:mysql:" string out: $s = new CGI::Session( 'driver:mysql', $sid, {DataSource=>'shopping_cart'}); # is the same as: $s = new CGI::Session( 'driver:mysql', $sid, {DataSource=>'dbi:mysql:shopping_cart'}); BACKWARDS COMPATIBILITY As of V 4.30, the global variable $CGI::Session::MySQL::TABLE_NAME cannot be used to set the session table's name. This is due to changes in CGI::Session::Driver's new() method, which now allows the table's name to be changed (as well as allowing both the 'id' column name and the 'a_session' column name to be changed). See the documentation for CGI::Session::Driver::DBI for details. In particular, the new syntax for "new()" applies to all database drivers, whereas the old - and bad - global variable method only applied to MySQL. Alternately, call $session -> table_name('new_name') just after creating the session object if you wish to change the session table's name. LICENSING
For support and licensing see CGI::Session. perl v5.16.3 2008-07-16 CGI::Session::Driver::mysql(3)
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