The expression specified in the EVALUATE statement is not a valid table expression - ssas

Question

I'm working on a Tabular cube in Visual Studio.
I have a DAX formula in the cube that works fine:
SUMX(FILTER(factFHA, factFHA[EventCd]="D"), [LoanCount])
When I run it in SSMS as:
evaluate(
SUMX(FILTER(factFHA, factFHA[EventCd]="D"), [LoanCount])
)
it fails with following error:
Query (1, 1) The expression specified in the EVALUATE statement is not a valid table expression.
I have 2 other formulas that both work fine:
evaluate(factFHA)
evaluate(filter('factFHA', [EventCd] = "D"))
I can't figure out what is wrong with the SUMX with FILTER
Please advise. Thank you.

Answer 1

EVALUATE function only works if you pass a table or an expression that returns a table, you are passing a SUMX function which return a scalar value (Decimal).
The syntax to write queries using DAX, is as follows:
[DEFINE { MEASURE <tableName>[<name>] = <expression> } -> Define a session (optional) measure
EVALUATE <table> --> Generate a table using your measures or creating calculated columns
[ORDER BY {<expression> [{ASC | DESC}]}[, …] --> Order the returned table by a passed column or expression
[START AT {<value>|<parameter>} [, …]]] --> This is an ORDER BY Sub-clause to define from which the query results will start.
Define your measure then use then use it inside the EVALUATE clause using a expression that evaluates to a table.
DEFINE
MEASURE factFHA[MyMeasure] =
SUMX ( FILTER ( factFHA, factFHA[EventCd] = "D" ), [LoanCount] )
EVALUATE
( SUMMARIZE ( FILTER ( factFHA, factFHA[EventCd] = "D" ), factFHA[AnyColumnToGroup]
, "Sum of MyMeasure", SUM ( factFHA[MyMeasure] ) ) )
Let me know if this helps.