Load List /Array of values into variable from MS SQL

I'm trying to load a variable with the list of results of a SQL query. I can access the first first value in the results but how do I get at the next one or a random value

[Variablename].[ColumnName] gives the first value
[Variablename]_[Columnname]_rand doesn't work
[Variablename]_[Columnname]_n doesn't work ??