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Note: In the Logical Join, you can create a temporal join between the date field of the fact
table to an interval (to and from) field of the attribute view. The temporal join has to start from
the fact table such that the single column must be in the fact table and, the to and from
columns must be in the table that is directly joined to the fact table. The join type must be a
referential join. The supported data types are timestamp, date, and integer.
Restriction: While creating joins you must ensure that a table does not appear twice in any join path (in
particular a self join is not supported). A join path is the set of joins that links the fact table to other
tables.
While creating joins between analytic view and attribute view the same table cannot be used both in
the join path of analytic view and attribute view. Also, in a join path of analytic view and attribute view,
the table of the attribute view which is linked to the fact table should not have an alias table.
3. Optional Step: Create Calculated Column
a) In the Output of Logical Join panel, right-click Calculated Columns.
b) In the context menu, choose New.
c) Enter a name and description (label) for the calculated column.
d) Select a data type, and enter the length and scale for the calculated column.
e) Select the Column Type to determine whether it is a calculated attribute or a calculated measure.
f) If you select Calculate Before Aggregation, select the aggregation type.
Note: If you select Calculate Before Aggregation, the calculation happens as per the expression
specified and then the results are aggregated as SUM, MIN, MAX or COUNT. If Calculate Before
Aggregation is not selected, the data is not aggregated but it gets calculated as per calculation
expression (formula), and the aggregation is shown as FORMULA. If the aggregation is not set,
then it will be considered as an attribute.
g) In the Expression Editor enter the expression. For example, you can write a formula:
if("PRODUCT" = 'ABC, "DISCOUNT" * 0.10, "DISCOUNT") which is equivalent to, if attribute PRODUCT
equals the string ‘ABC’ then DISCOUNT equals to DISCOUNT multiplied by 0.10 should be returned.
Otherwise the original value of attribute DISCOUNT should be used.
Note: The expression can also be assembled by dragging and dropping the expression elements
from the menus below the editor window.
h) If you want to associate the calculated column with currency and unit of measuring quantity, select the
Advanced tab page and select the required Type.
i) Choose OK.
Remember: Calculated Columns can be created only at the Logical Join level and not at the Data
Foundation level.
Note: The aggregation type for calculated columns is only taken into account, if they are calculated
before aggregation
4. Optional Step: Create Restricted Columns
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You can create restricted columns if you want to filter the value for an output field based on the user-defined
rules. For example, you can choose to restrict the value for the Revenue column only for Region = APJ, and
Year = 2012.
P U B L I C
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SAP HANA Developer Guide
Setting Up the Analytic Model