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Sampling |
An aggregate step that performs the sampling of data. |
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Statistics |
An aggregate step that operates on grouped rows and computes a new function value for the row given the function specification. This is similar to aggregates in that it operates on grouped rows and a filtering QUALIFY clause analogous to the HAVING clause. It is different from aggregates because it returns a value for each participating row (unless filtered out), and it allows other descriptive columns that are not in the group-by list to be specified in the SELECT list. |
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Sum |
An aggregate operator that returns a column value. The value is the arithmetic sum for a specified expression for a group. An expression is a constant or column expression for which the sum value is computed and that cannot contain any ordered analytic or aggregate functions. |