Deleting Rows
Often, people ask for a macro to delete all blank rows or all duplicate rows from a range of rows in a worksheet. This page has three macros, DeleteBlankRows, DeleteRowOnCell, and DeleteDuplicateRows, which will do this. Remember, these macros delete entire rows from your worksheet. They do not delete individual cells. The DeleteBlankRows procedure shown below will delete all blank rows in the worksheet specified by the WorksheetName parameter. If this parameter is omitted, the active sheet is used. The procedure will delete rows that are entirely blank or contain cells that have only a single apostrophe (text formatting control character). The procedure requires the IsRowClear function, shown after the DeleteBlankRows procedure. It will not delete rows that contain formulas, even if that formula returns an empty value. The function will not delete rows that are precedents of a formula in a cell if those precedent rows have lower row number than the row. For example, if rows 1 to 5 are completely blank, and a formula in A10 references rows 1 to 5, rows 1 to 5 will not be deleted. However, if a formula refers to a range in higher numbered rows than the cell containing the formula, and those rows are entirely blank, those rows referenced by the formula will be deleted. Therefore, the reference of the formula may be changed as rows above the formula are deleted. Sub DeleteBlankRows(Optional WorksheetName As Variant) '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' DeleteBlankRows ' This function will delete all blank rows on the worksheet ' named by WorksheetName. This will delete rows that are ' completely blank (every cell = vbNullString) or that have ' cells that contain only an apostrophe (special Text control ' character). ' The code will look at each cell that contains a formula, ' then look at the precedents of that formula, and will not ' delete rows that are a precedent to a formula. This will ' prevent deleting precedents of a formula where those ' precedents are in lower numbered rows than the formula ' (e.g., formula in A10 references A1:A5). If a formula ' references cell that are below (higher row number) the ' last used row (e.g, formula in A10 reference A20:A30 and ' last used row is A15), the refences in the formula will ' be changed due to the deletion of rows above the formula. ' '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Dim RefColl As Collection Dim RowNum As Long Dim Prec As Range Dim Rng As Range Dim DeleteRange As Range Dim LastRow As Long Dim FormulaCells As Range Dim Test As Long Dim WS As Worksheet Dim PrecCell As Range If IsMissing(WorksheetName) = True Then Set WS = ActiveSheet Else On Error Resume Next Set WS = ActiveWorkbook.Worksheets(WorksheetName) If Err.Number <> 0 Then ''''''''''''''''''''''''''''''' ' Invalid worksheet name. ''''''''''''''''''''''''''''''' Exit Sub End If End If If Application.WorksheetFunction.CountA(WS.UsedRange.Cells) = 0 Then '''''''''''''''''''''''''''''' ' Worksheet is blank. Get Out. '''''''''''''''''''''''''''''' Exit Sub End If '''''''''''''''''''''''''''''''''''''' ' Find the last used cell on the ' worksheet. '''''''''''''''''''''''''''''''''''''' Set Rng = WS.Cells.Find(what:="*", after:=WS.Cells(WS.Rows.Count, WS.Columns.Count), lookat:=xlPart, _ searchorder:=xlByColumns, searchdirection:=xlPrevious, MatchCase:=False) LastRow = Rng.Row Set RefColl = New Collection ''''''''''''''''''''''''''''''''''''' ' We go from bottom to top to keep ' the references intact, preventing ' #REF errors. ''''''''''''''''''''''''''''''''''''' For RowNum = LastRow To 1 Step 1 Set FormulaCells = Nothing If Application.WorksheetFunction.CountA(WS.Rows(RowNum)) = 0 Then '''''''''''''''''''''''''''''''''''' ' There are no nonblank cells in ' row R. See if R is in the RefColl ' reference Collection. If not, ' add row R to the DeleteRange. '''''''''''''''''''''''''''''''''''' On Error Resume Next Test = RefColl(CStr(RowNum)) If Err.Number <> 0 Then '''''''''''''''''''''''''' ' R is not in the RefColl ' collection. Add it to ' the DeleteRange variable. '''''''''''''''''''''''''' If DeleteRange Is Nothing Then Set DeleteRange = WS.Rows(RowNum) Else Set DeleteRange = Application.Union(DeleteRange, WS.Rows(RowNum)) End If Else '''''''''''''''''''''''''' ' R is in the collection. ' Do nothing. '''''''''''''''''''''''''' End If On Error GoTo 0 Err.Clear Else ''''''''''''''''''''''''''''''''''''' ' CountA > 0. Find the cells ' containing formula, and for ' each cell with a formula, find ' its precedents. Add the row number ' of each precedent to the RefColl ' collection. ''''''''''''''''''''''''''''''''''''' If IsRowClear(RowNum:=RowNum) = True Then ''''''''''''''''''''''''''''''''' ' Row contains nothing but blank ' cells or cells with only an ' apostrophe. Cells that contain ' only an apostrophe are counted ' by CountA, so we use IsRowClear ' to test for only apostrophes. ' Test if this row is in the ' RefColl collection. If it is ' not in the collection, add it ' to the DeleteRange. ''''''''''''''''''''''''''''''''' On Error Resume Next Test = RefColl(CStr(RowNum)) If Err.Number = 0 Then '''''''''''''''''''''''''''''''''''''' ' Row exists in RefColl. That means ' a formula is referencing this row. ' Do not delete the row. '''''''''''''''''''''''''''''''''''''' Else If DeleteRange Is Nothing Then Set DeleteRange = WS.Rows(RowNum) Else Set DeleteRange = Application.Union(DeleteRange, WS.Rows(RowNum)) End If End If Else On Error Resume Next Set FormulaCells = Nothing Set FormulaCells = WS.Rows(RowNum).SpecialCells(xlCellTypeFormulas) On Error GoTo 0 If FormulaCells Is Nothing Then ''''''''''''''''''''''''' ' No formulas found. Do ' nothing. ''''''''''''''''''''''''' Else ''''''''''''''''''''''''''''''''''''''''''''''''''' ' Formulas found. Loop through the formula ' cells, and for each cell, find its precedents ' and add the row number of each precedent cell ' to the RefColl collection. ''''''''''''''''''''''''''''''''''''''''''''''''''' On Error Resume Next For Each Rng In FormulaCells.Cells For Each Prec In Rng.Precedents.Cells RefColl.Add Item:=Prec.Row, key:=CStr(Prec.Row) Next Prec Next Rng On Error GoTo 0 End If End If End If ''''''''''''''''''''''''' ' Go to the next row, ' moving upwards. ''''''''''''''''''''''''' Next RowNum '''''''''''''''''''''''''''''''''''''''''' ' If we have rows to delete, delete them. '''''''''''''''''''''''''''''''''''''''''' If Not DeleteRange Is Nothing Then DeleteRange.EntireRow.Delete shift:=xlShiftUp End If End Sub Function IsRowClear(RowNum As Long) As Boolean '''''''''''''''''''''''''''''''''''''''''''''''''' ' IsRowClear ' This procedure returns True if all the cells ' in the row specified by RowNum as empty or ' contains only a "'" character. It returns False ' if the row contains only data or formulas. '''''''''''''''''''''''''''''''''''''''''''''''''' Dim ColNdx As Long Dim Rng As Range ColNdx = 1 Set Rng = Cells(RowNum, ColNdx) Do Until ColNdx = Columns.Count If (Rng.HasFormula = True) Or (Rng.Value <> vbNullString) Then IsRowClear = False Exit Function End If Set Rng = Cells(RowNum, ColNdx).End(xlToRight) ColNdx = Rng.Column Loop IsRowClear = True End Function
DeleteRowOnCell Public Sub
DeleteRowOnCell() This macro will delete duplicate rows in a range. To use, select a singlecolumn range of cells, comprising the range of rows from which duplicates are to be deleted, e.g., C2:C99. To determine whether a row has duplicates, the values in the selected column are compared. Entire rows are not compared against one another. Only the selected column is used for comparison. When duplicate values are found in the active column, the first row remains, and all subsequent rows are deleted. Public Sub DeleteDuplicateRows() In the following examples, suppose we have select cells A1:A10 before running the DeleteDuplicateRows macro:


This illustrates the range before running DeleteDuplicateRows. 


This illustrates the range after running DeleteDuplicateRows.  
Here's another procedure that may be useful. Suppose you have two columns of data  column A containing some names, and column B containing some dates. If the data is grouped (not necessarily sorted) by column A (but not necessarily by column B), this code will delete the duplicates rows, but retaining the latest entry (by column B) of each name in column A. Sub DeleteTheOldies() These examples show some data before and after running the code.
Other Excel formulas and VBA procedures for working with duplicate and unique entries in lists can be found on the following pages: 

