Many-to-one mapping is where many sources are selected and assigned to a target. This could be a message source and a database source both mapped onto a common target.
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A second example might involve adding two source values and placing the result into a single target value.
When a many-to-one mapping is performed, you must define how the multiple elements are dealt with when they are placed into the single target element. For example, the source elements might need to be concatenated or have a mathematical function applied to them.
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