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Full Discussion: Getting Rows from a MySQL Table with max values?
Top Forums Programming Getting Rows from a MySQL Table with max values? Post 302633837 by 47shailesh on Wednesday 2nd of May 2012 01:56:06 PM
Old 05-02-2012
I agree, full table scan will happen, and index on DR_RefKey desc is required
Tested this in Oracle
Code:
select * from Test_DC_Trailer where rownum=1 order by DR_RefKey desc

Equivalent in MySQL would be(not tested)
Code:
select * from Test_DC_Trailer where limit 1 order by DR_RefKey desc

 

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LEARN ABOUT OPENSOLARIS

perror

perror(1)							  MySQL database							 perror(1)

NAME

       perror - describes a system or MySQL error code.

SYNOPSIS

       perror [OPTIONS] [ERRORCODE [ERRORCODE...]]

DESCRIPTION

       Can  be	used  to display a description for a system error code, or an MyISAM/ISAM table handler error code.  The error messages are mostly
       system dependent.

OPTIONS

       -?|--help
	      Displays this help and exits.

       -I|--info
	      Synonym for the above.

       -s|--silent
	      Only print the error message

       -v|--verbose
	      Print error code and message (default).

       -V|--version
	      Displays version information and exits.

EXAMPLE

       shell> perror 64 79 Error code  64:  Machine is not on the network Error code  79:  Can not access a needed shared library

SEE ALSO

       isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privi-
       lege_tables(1), mysqlshow(1), mysql_zap(1), replace(1)

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

BUGS

       Please refer to http://bugs.mysql.com/ to report bugs.

AUTHOR

       Ver 1.0, distribution 4.0.24 Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com/).  This  software  comes  with	no
       warranty.   Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercur-
       media.com)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+------------------------------------+
       |  ATTRIBUTE TYPE    |	       ATTRIBUTE VALUE		 |
       +--------------------+------------------------------------+
       |Availability	    | SUNWmysqlr, SUNWmysqlu, SUNWmysqlt |
       +--------------------+------------------------------------+
       |Interface Stability | External				 |
       +--------------------+------------------------------------+
NOTES

       Source for mysql is available on http://opensolaris.org.

MySQL 4.0							 19 December 2000							 perror(1)
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