1 CSE 2337 Chapter 5 Retrieving Data with Lookups

2 Objectives VLOOKUP HLOOKUP LOOKUP INDEX

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 Vertical Lookups

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 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 VLOOKUP Arguments

8 VLOOKUP Algorithm

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 Exact Match

11 Horizontal Lookups

12 Horizontal Lookup

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

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15 HLOOKUP

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 Separate Sheets

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)

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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…

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23 Index