From Joomla! Documentation
The method loadAssocList is like an array of the loadAssoc for each row of the table.
Let's use "staalanden" table that was created on his tutorial Developing a Model-View-Controller Component - Part 3 - Using the Database
Fields were "ID" and "greeting", let's do a query like "select * from #__hello"
Array(=>Array([ID]=>1,[greeting]=>Hello, World!),=>Array([ID]=>2,[greeting]=>Bonjour, Monde!),=>Array([ID]=>3,[greeting]=>Ciao, Mondo!))
The method can get a parameter which must be a field name of the result query, it will change the array index into the field name of the row.