Harry Bailey » SQL http://harrybailey.com just a little bit geeky Tue, 24 Aug 2010 12:15:01 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 MySQL Multiple Primary Key Columns In A Table http://harrybailey.com/2009/05/mysql-multiple-primary-key-columns-in-a-table/ http://harrybailey.com/2009/05/mysql-multiple-primary-key-columns-in-a-table/#comments Fri, 01 May 2009 13:46:23 +0000 Harry http://harrybailey.com/?p=280 Some database management tools refuse to admit you can add multiple primary key columns to one table, so you might have to do it with direct sql syntax ( deep intake of breath ).

Multiple primary keys make ‘ON DUPLICATE KEY UPDATE column = column + 100′ type queries a shed load more flexible.

Anyway, on with the code:

ALTER TABLE tablename ADD PRIMARY KEY (column_one, column_two)

And there you have it. Robert’s your fathers brother.

]]> http://harrybailey.com/2009/05/mysql-multiple-primary-key-columns-in-a-table/feed/ 5 Return Number Of Rows With PHP From SQL Database http://harrybailey.com/2009/04/return-number-of-rows-with-php-from-sql-database/ http://harrybailey.com/2009/04/return-number-of-rows-with-php-from-sql-database/#comments Wed, 08 Apr 2009 20:52:29 +0000 Harry http://harrybailey.com/?p=254 Occasionally working with SQL databases (not my beloved MySQL) I always struggled getting the number of rows in a consistant manner.

Until now…

It’s a simple fix. Add ‘ORDER BY’ to your SQL select. It doesn’t matter if you are just getting back items where the order doesn’t matter, use an order by clause in your select and you will always get the number of rows back successfully.

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