1. 1 CSE 2337 Chapter 5 Retrieving Data with Lookups

2. 2 Objectives VLOOKUP HLOOKUP LOOKUP INDEX

3. 3 Lookup Tables in Excel Lookup Table – A data list that categorizes values that are needed elsewhere Better than nested ifs – extensibility Better than hard coding - redundancy

4. 4 Vertical Lookups

5. 5 Example Vertical Lookup Tables Goal: Given a quantity, what is the unit price?? Goal: Given a method, what is the cost per unit??

6. 6 VLOOKUP VLOOKUP function –Most effective and flexible way to retrieve data organized in columns –Searches specified part of worksheet for data, starting with the first column –=VLOOKUP(lookup_value,table_array, col_index_num,range_lookup) –Must specify col_index_num

7. 7 VLOOKUP Arguments

8. 8 VLOOKUP Algorithm

9. 9 Exact Match If using lookup type of FALSE, VLOOKUP only looks for an exact match Sorted ascending not required VLOOKUP function displays #N/A in cell if exact match is not found

10. 10 Exact Match

11. 11 Horizontal Lookups

12. 12 Horizontal Lookup

13. 13 HLOOKUP HLOOKUP function –Looks up a value by testing for a criterion across a row –HLOOKUP(lookup_value,table_array, row_index_num,range_lookup) –Must specify row_index_num Similar to VLOOKUP function, except that values are tested across the row First row of lookup table must be sorted in ascending order

14. 14

15. 15 HLOOKUP

16. 16 Other Worksheets Use VLOOKUP and HLOOK for accessing data on other worksheets –Data may be placed on separate sheet when it is a long table

17. 17 Separate Sheets

18. 18 LOOKUP Use LOOKUP function –Looks up the greatest value that does not exceed a specified value anywhere in a table or range –Can retrieve data from a lookup table with a vertical or horizontal orientation –Uses only a TRUE lookup type; column or row containing lookup values must be in ascending order –LOOKUP(lookup_value,lookup_vector, result_vector)

19. 19

20. 20

21. 21 Index Function Use INDEX function with two- or three- dimensional tables –Returns the value in a table based on row and column numbers that you specify –=INDEX(reference,row_num,column_num, area_num) –Has several guidelines – See p 305 of text…

22. 22

23. 23 Index