MemoSoup » mysql http://www.memosoup.com Mix of the things I always forget Fri, 30 Jul 2010 15:59:38 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 mysql: rownum functionality http://www.memosoup.com/20091027/mysql-rownum-functionality.html http://www.memosoup.com/20091027/mysql-rownum-functionality.html#comments Tue, 27 Oct 2009 10:45:13 +0000 admin http://www.memosoup.com/?p=211 Here are some examples how to use “rownum” functionality (similar to Oracle) in mysql

UPDATE mytable SET col1 = 'somevalue' ORDER BY col2 LIMIT 300

rownum analog:

SELECT @rownum:=@rownum+1 rownum, mytable.* FROM (SELECT @rownum:=0) [...]]]> Here are some examples how to use “rownum” functionality (similar to Oracle) in mysql

UPDATE mytable
SET col1 = 'somevalue'
ORDER BY col2
LIMIT 300

rownum analog:

SELECT @rownum:=@rownum+1 rownum, mytable.*
FROM (SELECT @rownum:=0) r, mytable;
]]> http://www.memosoup.com/20091027/mysql-rownum-functionality.html/feed 1 mySQL: size of the database http://www.memosoup.com/20091016/mysql-size-of-the-database.html http://www.memosoup.com/20091016/mysql-size-of-the-database.html#comments Fri, 16 Oct 2009 15:23:53 +0000 admin http://www.memosoup.com/?p=204 This will work in mySQL 5.0.2 and newer. Use SHOW TABLE STATUS command for [...]]]>
SELECT table_schema "Database",
 sum( data_length + index_length ) / 1024 / 1024 "Size (MB)",
 sum( data_free )/ 1024 / 1024 "Free (MB)"
FROM information_schema.TABLES
GROUP BY table_schema ;

This will work in mySQL 5.0.2 and newer. Use SHOW TABLE STATUS command for other versions.

]]> http://www.memosoup.com/20091016/mysql-size-of-the-database.html/feed 0 MySQL: start SQL from shell script http://www.memosoup.com/20090918/mysql-start-sql-from-shell-script.html http://www.memosoup.com/20090918/mysql-start-sql-from-shell-script.html#comments Fri, 18 Sep 2009 15:15:53 +0000 admin http://www.memosoup.com/?p=134 The following code starts the SQL from the shell script directly, without additional SQL file

#!/bin/sh --/. &> /dev/null; exec mysql "$@" select 'Hello, world!' as test ;

The detailed explanation of the trick [...]]]> The following code starts the SQL from the shell script directly, without additional SQL file

#!/bin/sh
--/. &> /dev/null; exec mysql "$@"

select 'Hello, world!' as test ;

The detailed explanation of the trick is here

]]> http://www.memosoup.com/20090918/mysql-start-sql-from-shell-script.html/feed 0