Apple numbers User Manual

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Chapter 12
    Dictionary of Functions 
 
VLOOKUP
The VLOOKUP function retrieves a value from a range of columns by using a match 
with a left column value to choose the row and a column number to choose the 
column in that row.
VLOOKUP(search-valuecell-rangecolumn, [exact-match])
 search-value:  The value you want to look for in the left column of the range to 
choose a row.
 cell-range:  The range of cells containing your data. The left column contains the data 
to be searched; the remaining rows contain values you can retrieve.
 column:  A number that specifies the relative column number of the cell from which 
you want to retrieve the value. The left column of the range is column 1.
 exact-match:  Optional Boolean value; determines whether an exact value is required:
TRUE, 1, or omitted selects the column with the largest top-row value that is less 
than the search value if there is no exact match.
FALSE or 0 returns an error if there is no exact match.
  
Examples
Given the following table:
  
VLOOKUP(20, B2:E6, 2) returns E.
VLOOKUP(21, B2:E6, 2) returns E.
VLOOKUP("M", C2:E6, 2) returns dolor.
VLOOKUP("blandit", D2:E6, 2) returns 5.
VLOOKUP(21, B2:E6, 2, FALSE) returns an error because no value in the left column exactly matches 21.