Vivek, The steps given earlier are not exactly good. Try it this way -
1. Select the cell A1 2. Data --> Data Validation --> Settings 3. From the Allow dropdown list, select Custom. 4. Enter the following COUNTIF formula in the Formula box: =COUNTIF(A:A,A1)=1 5. Select the Error Alert tab. 6. In the Title box, enter "Duplicate Entry". 7. In the Error Message box, enter "The value you entered already exists. Please re-enter." 8. Click OK. 9. Copy A1 10. Select the cells of Col. A till you want the validation (Say A1 to A2000) or just select the column if you want it for entire A Col. 11. RightClick - Paste Special - Validation. Click Ok. Let me know if you need any further help with this. Regards, AJ On Sat, Mar 27, 2010 at 10:43 AM, Abhishek Jain <abhishek....@gmail.com>wrote: > Vivek, > > Have you tried Data Validation ? > > See this: > > 1. Select the range to validate (cells A2:A10) > 2. Data --> Data Validation --> Settings > 3. From the Allow dropdown list, select Custom. > 4. Enter the following COUNTIF formula in the Formula box: > =COUNTIF(A:A,A1)=1 > 5. Select the Error Alert tab. > 6. In the Title box, enter "Duplicate Entry". > 7. In the Error Message box, enter "The value you entered already exists. > Please re-enter." > 8. Click OK. > > > A sample workbook is attached. > > Cheers! > > > AJ > > On Fri, Mar 26, 2010 at 4:51 PM, C Vivek <cvive...@gmail.com> wrote: > >> Hello All... >> >> A Column in a sheet must have only unique nos... >> >> when we enter the same no again it have to give t message NO ALREADY >> EXIST. >> >> >> pls help to to find it out. >> >> Thanking you, >> Vivek Chandran, >> Ooty - TN >> >> -- >> >> ---------------------------------------------------------------------------------- >> Some important links for excel users: >> 1. Follow us on TWITTER for tips tricks and links : >> http://twitter.com/exceldailytip >> 2. Join our Facebook Group @ >> http://www.facebook.com/group.php?gid=287779555678 >> 3. Excel tutorials at http://www.excel-macros.blogspot.com >> 4. Learn VBA Macros at http://www.quickvba.blogspot.com >> 5. Excel Tips and Tricks at http://exceldailytip.blogspot.com >> >> To post to this group, send email to excel-macros@googlegroups.com >> >> <><><><><><><><><><><><><><><><><><><><><><> >> HELP US GROW !! >> >> We reach over 6,800 subscribers worldwide and receive many nice notes >> about the learning and support from the group.Let friends and co-workers >> know they can subscribe to group at >> http://groups.google.com/group/excel-macros/subscribe >> >> To unsubscribe from this group, send email to excel-macros+ >> unsubscribegooglegroups.com or reply to this email with the words "REMOVE >> ME" as the subject. >> > > -- ---------------------------------------------------------------------------------- Some important links for excel users: 1. Follow us on TWITTER for tips tricks and links : http://twitter.com/exceldailytip 2. Join our Facebook Group @ http://www.facebook.com/group.php?gid=287779555678 3. Excel tutorials at http://www.excel-macros.blogspot.com 4. Learn VBA Macros at http://www.quickvba.blogspot.com 5. Excel Tips and Tricks at http://exceldailytip.blogspot.com To post to this group, send email to excel-macros@googlegroups.com <><><><><><><><><><><><><><><><><><><><><><> HELP US GROW !! We reach over 6,800 subscribers worldwide and receive many nice notes about the learning and support from the group.Let friends and co-workers know they can subscribe to group at http://groups.google.com/group/excel-macros/subscribe To unsubscribe from this group, send email to excel-macros+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
