/*You can try this*/
Multiply_Result = Sum(X,0.0)*Sum(Y,0.0);
/*Sum function will handle missing values for you. Any missing value for X or Y will be set to (Zero) */
/*You can use Sum function also in complex equations like X/Y*Z-N/E to be Sum(X,0.0)/Sum(Y,0.0)*Sum(Z,0.0)-Sum(N,0.0)/Sum(E,0.0) */
/*I use "Sum" function as if it was like "ISNULL" in sql server */
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