1 workbook, 2 worksheets (or tabs)
On tab 1, I want a formula/alert that tells the user if any duplicate values exist in Column A of tab 2
Tab 2, Column A, has Unique ID's (6 digit numeric values)
The user manually inputs the ID's on new rows in Column A
Row 1 is reserved and in use for something else
Row 2 is my header, so cell A2 says "ID"
Row 3-623 currently contain unique ID's
When the user inputs a new ID into cell A624, then they return to Tab 1, I want my formula/alert on Tab 1 to tell the user that they have duplicates in Column A of tab 2. I know the Conditional Formatting, but if the user copies in 100 new values, they won't necessarily see the highlighted cells. My tab 1 is my "checks and balances" and the last place the user is suppposed to look to ensure that they haven't created any duplicate ID's. If the user sees a warning message that says duplicates exist, then I'll tell them that they need to look at column A (for cells that have been conditionally highlighted).
One issue that I'm running into with the conditional highlighting is that I want cells A3:A1048576 to already have the conditional formatting - this way when the user inserts a value into Cell A624, then A625, etc they conditional formatting is already there. Right now with data in cells A3:A623, cells A624:A1048576 are all highlighted with the Red/Bold Red Font (which is okay I guess), but ideally it would be nice to not count 2+ empty cells as duplicates and I'll have to have my formula on Tab 1 not include the blank cells.
I DO NOT want to use the Remove Duplicates feature of Excel 2010. If I remove them I could be removing data in columns B, C, D, etc that belong to the Unique ID. I just need the user to be told in Tab 1 that they DO have duplicates and I'll train the user how to research this and fix it.
The reason I want to look for duplicates in the entire Column A is because the list of Unique ID's will grow over time.
I hope all of this makes sense and thanks in advance for the help.
On tab 1, I want a formula/alert that tells the user if any duplicate values exist in Column A of tab 2
Tab 2, Column A, has Unique ID's (6 digit numeric values)
The user manually inputs the ID's on new rows in Column A
Row 1 is reserved and in use for something else
Row 2 is my header, so cell A2 says "ID"
Row 3-623 currently contain unique ID's
When the user inputs a new ID into cell A624, then they return to Tab 1, I want my formula/alert on Tab 1 to tell the user that they have duplicates in Column A of tab 2. I know the Conditional Formatting, but if the user copies in 100 new values, they won't necessarily see the highlighted cells. My tab 1 is my "checks and balances" and the last place the user is suppposed to look to ensure that they haven't created any duplicate ID's. If the user sees a warning message that says duplicates exist, then I'll tell them that they need to look at column A (for cells that have been conditionally highlighted).
One issue that I'm running into with the conditional highlighting is that I want cells A3:A1048576 to already have the conditional formatting - this way when the user inserts a value into Cell A624, then A625, etc they conditional formatting is already there. Right now with data in cells A3:A623, cells A624:A1048576 are all highlighted with the Red/Bold Red Font (which is okay I guess), but ideally it would be nice to not count 2+ empty cells as duplicates and I'll have to have my formula on Tab 1 not include the blank cells.
I DO NOT want to use the Remove Duplicates feature of Excel 2010. If I remove them I could be removing data in columns B, C, D, etc that belong to the Unique ID. I just need the user to be told in Tab 1 that they DO have duplicates and I'll train the user how to research this and fix it.
The reason I want to look for duplicates in the entire Column A is because the list of Unique ID's will grow over time.
I hope all of this makes sense and thanks in advance for the help.