@LokeshPolanki I think the fastest query would be to use a for each loop in a data transform regardless. There are other functions that will evaluate true for the first occurence within a pagelist (@IsInPageList) or we can sort the pagelist and iterate it @countInPageList times. Is there any special reason why you wouldn't want to loop over the list? 

Also, consider a declare expression to set the salutation that may come from a decision table (we did something like this with the addition of gender neutral salutations). If this has to be done in an activity for all existing employees, that will probably need a queuing mechanism.