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Full Discussion: MySQL join four tables!
Top Forums Programming MySQL join four tables! Post 302592775 by durden_tyler on Tuesday 24th of January 2012 08:57:42 PM
Old 01-24-2012
Quote:
Originally Posted by yifangt
What I wanted is to pick up all rows of the three tables (B, C & D) by the common key from col1 of TableA, i.e. A1 ~ A6, if B, C & D share any key of each col2 of B, C & D.
...
Not sure I understood that fully, but let's say you had only two tables "tablea" and "tableb". And they had data as follows -

Code:
mysql>
mysql>
mysql> select * from tablea;
+----+-----+
| id | agi |
+----+-----+
| A1 | O   |
+----+-----+
1 row in set (0.00 sec)

mysql>
mysql> select * from tableb;
+----+-----+
| id | agi |
+----+-----+
| B1 | A1  |
| B5 | A1  |
+----+-----+
2 rows in set (0.00 sec)

mysql>
mysql>
mysql>

What would have been your expected output in that case?

tyler_durden
 

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MYSQL_FIX_PRIVILE(1)					       MySQL Database System					      MYSQL_FIX_PRIVILE(1)

NAME
mysql_fix_privilege_tables - upgrade MySQL system tables SYNOPSIS
mysql_fix_privilege_tables --password=root_password DESCRIPTION
Note In MySQL 5.1.7, mysql_fix_privilege_tables was superseded by mysql_upgrade, which should be used instead. See mysql_upgrade(1). Some releases of MySQL introduce changes to the structure of the system tables in the mysql database to add new privileges or support new features. When you update to a new version of MySQL, you should update your system tables as well to make sure that their structure is up to date. Otherwise, there might be capabilities that you cannot take advantage of. mysql_fix_privilege_tables is an older script that previously was used to uprade the system tables in the mysql database after a MySQL upgrade. Before running mysql_fix_privilege_tables, make a backup of your mysql database. On Unix or Unix-like systems, update the system tables by running the mysql_fix_privilege_tables script: shell> mysql_fix_privilege_tables You must run this script while the server is running. It attempts to connect to the server running on the local host as root. If your root account requires a password, indicate the password on the command line like this: shell> mysql_fix_privilege_tables --password=root_password The mysql_fix_privilege_tables script performs any actions necessary to convert your system tables to the current format. You might see some Duplicate column name warnings as it runs; you can ignore them. After running the script, stop the server and restart it so that any changes made to the system tables take effect. On Windows systems, MySQL distributions include a mysql_fix_privilege_tables.sql SQL script that you can run using the mysql client. For example, if your MySQL installation is located at C:Program FilesMySQLMySQL Server 5.1, the commands look like this: C:> cd "C:Program FilesMySQLMySQL Server 5.1" C:> binmysql -u root -p mysql mysql> SOURCE share/mysql_fix_privilege_tables.sql Note Prior to version 5.1.17, the mysql_fix_privilege_tables.sql script is found in the scripts directory. The mysql command will prompt you for the root password; enter it when prompted. If your installation is located in some other directory, adjust the path names appropriately. As with the Unix procedure, you might see some Duplicate column name warnings as mysql processes the statements in the mysql_fix_privilege_tables.sql script; you can ignore them. After running the script, stop the server and restart it. COPYRIGHT
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc. 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
Sun Microsystems, Inc. (http://www.mysql.com/). MySQL 5.1 04/06/2010 MYSQL_FIX_PRIVILE(1)
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