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# Limiting Sets

An important aspect of building a set is limiting its membership. Many techniques exist to assist you with this, but the most basic employ the underlying relationships between data in the cube. These techniques limit members to those which exist in valid combinations with other members in the cube.

## Working with Auto-Exists

In the previous exercise, you performed a cross-join operation on two sets and observed a multiplicative effect in the resulting set. This multiplicative effect is characteristic of cross-joins between sets containing members from differing dimensions.

When cross-joins are performed between sets containing members of the same dimension, relationships between the attribute-hierarchies, whether direct or indirect, automatically ...

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