Question:

Column A1 Has dates Column B as data

A1 : 1/1/2010 : 5000
A2 : 2/1/2010 : 4000
A3 : 1/1/2010 : 5000
A4 : 5/1/2010 : 5000
A5 : 6/1/2010 : 4000

From column B the values which are duplicate i want to remove only those which are on same date .

Remove Duplicates from Column B by comparing from Column A Which has date. as, if the duplication is occurred on next date it should not be counted as not a duplicate because the same data is entered in the next date.

Example : Customer has Purchased Item A on 1/1/2010
Customer has purchase Item A on 1/1/2010

I want to assume that On 1/1/2010 Item A has a duplicate

If the customer has purchased Item A on 2/1/2010 . this is not duplicate because the item is purchased on the next date.

Array formula in D2:

=INDEX(\$A\$1:\$A\$5, SMALL(IF(MATCH(\$A\$1:\$A\$5&\$B\$1:\$B\$5, \$A\$1:\$A\$5&\$B\$1:\$B\$5, 0)=ROW(\$A\$1:\$A\$5)-MIN(ROW(\$A\$1:\$A\$5))+1, ROW(\$A\$1:\$A\$5)-MIN(ROW(\$A\$1:\$A\$5))+1, ""), ROW(A1))) + CTRL + SHIFT + ENTER

Array formula in E2:

=INDEX(\$B\$1:\$B\$5, SMALL(IF(MATCH(\$A\$1:\$A\$5&\$B\$1:\$B\$5, \$A\$1:\$A\$5&\$B\$1:\$B\$5, 0)=ROW(\$A\$1:\$A\$5)-MIN(ROW(\$A\$1:\$A\$5))+1, ROW(\$A\$1:\$A\$5)-MIN(ROW(\$A\$1:\$A\$5))+1, ""), ROW(A1))) + CTRL + SHIFT + ENTER

remove dupes on same date.xls
(Excel 97-2003 Workbook *.xls)

IF(logical_test;[value_if:true];[value_if_false])
Checks whether a condition is met, and returns one value if TRUE, and another value if FALSE

SMALL(array,k) returns the k-th smallest row number in this data set.

INDEX(array,row_num,[column_num])
Returns a value or reference of the cell at the intersection of a particular row and column, in a given range

MIN(number1,[number2])
Returns the smallest number in a set of values. Ignores logical values and text

ROW(reference) returns the rownumber of a reference

MATCH(lookup_value;lookup_array; [match_type])
Returns the relative position of an item in an array that matches a specified value