For expressions used to define column derivation and transformations, PK Submit supports the rules set by Microsoft. (The source of the information in this section can be found on Microsoft’s website.)
Transformation expressions can be used to create calculated columns. A second use is to create an aggregate column. Similar to a calculated value, an aggregate performs an operation based on the complete set of rows in the table. A simple example is to count the number of rows returned in the set.
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