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Bug #18602 Table left joins return wrong results
Submitted: 2002-07-26 13:52 UTC Modified: 2002-07-26 14:56 UTC
From: php_bugs at intrax dot com Assigned:
Status: Not a bug Package: MySQL related
PHP Version: 4.2.2 OS: all (bug in RH7.2 & Tru64 4.0F)
Private report: No CVE-ID: None
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From: php_bugs at intrax dot com
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PHP Version: OS:

 

 [2002-07-26 13:52 UTC] php_bugs at intrax dot com
Linux:
	MySQL v3.53.21
	Server version: Apache/2.0.39
Tru64 Unix:
	MySQL v3.21.3
	Server version: Apache/1.3.6 and
	Server version: Apache/2.0.39
	
PHP compile line:
	configure --with-mysql=/usr/local \
		--with-apxs2=/usr/local/apache2/bin/apxs

MySQL database schema:
Project table:
	primary key (projname)
	projname varchar(60)
	si_guy   varchar(30)
	hw_guy   varchar(30)
	sw_guy   varchar(30)
User table:
	primary key (user)
	user     varchar(30)
	fullname varchar(30)


With either version of MySQL, typing this query into MySQL's command line interface works:

select p.projname, u1.fullname, u2.fullname,
	u3.fullname from projects p
        left join users u1 on u1.user = p.si_guy
        left join users u2 on u2.user = p.sw_guy
        left join users u3 on u3.user = p.hw_guy


However, this PHP query returns the project name, and the hw_guy only.  If I shuffle the left joins around, I find that PHP always returns the last left join, and drops the two other left joins.

<?php
    /* Connecting, selecting database */
    $link = mysql_connect() or die("Can't connect to MySQL database!");
    mysql_select_db("proj2") or die("Could not select the project database");
    
    /* Performing SQL query */
    $query = "select p.projname, u1.fullname,
	u2.fullname, u3.fullname from projects p
        left join users u1 on u1.user = p.si_guy
        left join users u2 on u2.user = p.sw_guy
        left join users u3 on u3.user = p.hw_guy";

    $result = mysql_query($query) or die("Query failed");
    while ($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
       print "<TR>\n";
       foreach ($line as $col_value) {
           print "\t\t<TD ALIGN=CENTER>$col_value</TD>\n";
       }
       print "</TR>\n";
    }
    mysql_free_result($result);
    mysql_close($link);
?>

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 [2002-07-26 14:56 UTC] php_bugs at intrax dot com
id 10 T error
 
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