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Chapter 6. Set Operations > The UNION Set Operation
6.1. The UNION Set Operation
In set theory, the union of two sets (call them A and B) is the set containing all elements of both A and B. In other words, if an element belongs to any of the input sets, it belongs to the result set. Figure 6-1 shows a set diagram (also known as a Venn diagram) with a graphical depiction of the union of two sets. The area marked with diagonal lines represents the result of the set operation.
Figure 6-1. Union of two sets
