A filter is made up of a collection of elements. The
available element types include condition, logical, and subquery elements.
Condition elements
When constructing a filter, you can use a condition element
to make a comparison between database columns and values. On UNIX, you can also specify more
advanced conditions.
Logical elements
When you use a single condition element in a filter, you
are limited to simple comparisons. Logical elements allow two elements
to be combined for more complex comparisons.
Subquery elements
When constructing a filter, you can use a subquery element
to make a query in a condition.