An attempt to divide by the number zero was detected for the specified SQL operator. The most likely cause of the problem is that one of the values of a column is zero, and that column is used in the denominator of a division operation. To protect against this case the NULLIF function can be used. For example, instead of the expression 1/X, specify 1/NULLIF(X,0), which will set the expression to null whenever the value if X is zero.