An expression is any mathematical expression, that when evaluated will produce a single value. Expressions may work on numbers, text, dates or any other Eightwire data type.

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For example, a simple expression to perform basic arithmetic could be:

(3 * 2) + 7

This would result in the destination column containing the numeric value 13 for each row.

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Similarly, functions may be used to manipulate data, such as this one, to give just the first part of a multi-part term:

FirstToken("the quick brown fox")

This would result in the destination column containing the text value ‘the’.

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Lastly, system metadata and data from the source table may also be included. This example combines the System Batch ID with the value in the source Key column:

System("Batch.ID") + Data("Key")

This would result in the destination column containing a different value for each row, something like "1055737Jane", "1055737Bob", "1055737Mel", etc.

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The following pages show the operators and functions available when using Process Expressions;