If the offsets of a frame are not within the partition or table, the aggregate function calculates within the partition. The function does not return NULL or a default value.

For example, you partition a table by seller ID and you order by quantity. You set the start offset to -3 and the end offset to 4.

The following image shows the partition and frame for the current input row:

The frame includes eight total rows, but the calculation remains within the partition. If you define an AVG function with this frame, the function calculates the average of the quantities inside the partition and returns 18.75.