UnPivot in the foreach loop container

Hi

I would like to "unpivot" SEQUENTIALLY each row in a table

Before the pivot task in the foreach loop container how to read sequentially each row ?

1/ from a PK ?

2/ from parameters with a WHERE field1 = ? and field2 = ? and field3=?....

These parameters have been set up prevoiouly in the loop

3/ Others ? ...

Thx for your help