PULL

This operation, proposed, like the previous one, in Agrawal, Gupta, & Sarawagi (1997), is the converse of the push operator. It creates a new dimension for a specified member of the elements. It is useful for converting an element into a dimension and, like the previous one, it allows dimensions and measures to be treated uniformly.

An example (taken from Agrawal, Gupta, & Sarawagi, 1997) is shown in Figure 20. In it the operator pulls the first member of each element as the new dimension "sales."

Figure 20