The IIF statement can be used in expressions to screen for division by zero:
SSRS does not short circuit IIF arguments. Therefore, using a single IIF function to screen for division by zero will have no effect and give an
Instead, a pair of nested IIF statements can be used. The outer IIF controls the value returned in the case of division by zero, 0 in the example above. The inner IIF is a "dummy" value that prevents the engine from actually performing a division by zero in this case.