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We change our formula from this… =VLOOKUP(A11,’Product Database’!A2:D7,2,FALSE)…to this… =IF(ISBLANK(A11),””,VLOOKUP(A11,’Product Database’!A2:D7,2,FALSE)) We can remedy this by judicious use of Excel’s IF() and ISBLANK() functions. This will cause our newly created VLOOKUP formulae to display error messages:

We would remove the sample item code from cell A11 and the “2” from cell D11.

The fourth argument is not bold, meaning that it’s optional: The first three arguments are shown in bold, indicating that they are mandatory arguments (the VLOOKUP function is incomplete without them and will not return a valid value).

Which piece of information from the database, associated with the unique identifier, do you wish to have retrieved for you?.What unique identifier are you looking up in the database?.You can think of this box as the function asking us the following questions: The Function Arguments box appears, prompting us for all the arguments (or parameters) needed in order to complete the VLOOKUP function. The system would return us a list of all lookup-related functions in Excel. To find the one we’re looking for, we could type a search term like “lookup” (because the function we’re interested in is a lookup function). A box appears that allows us to select any of the functions available in Excel.