In Google sheets, how could you prevent duplicate entry in a specific column? Actually, the Data validation in Google sheets can help you to finish this task. Prevent duplicate entry in Google sheets with Data validation Prevent duplicate entry in Microsoft Excel with Kutools for Excel Prevent duplicate entry in Google sheets with Data validationNormally, the Data validation in Google sheets can do you a favor, please do as this: 1. Select a list of cells that you want to prevent duplicates, and then click Data > Data validation, see screenshot:  2. In the Data validation dialog box: (1.) Choose Custom formula is from the drop down list, and enter this formula: =countif(A$2:A2,A2)=1 into the Criteria text box; (2.) Then select Reject input option from the On invalid data section. Note: In the above formula, A2 is the start cell of the column that you want to use. 3. Then click Save button, from now on, when duplicate data is entered in that specific column, a warning box will pop out to remind you, see screenshot: Prevent duplicate entry in Microsoft Excel with Kutools for ExcelIn Excel worksheet, you can prevent duplicate entries by using a useful tool-Kutools for Excel, with its Prevent Duplicate feature, you can quickly finish this task in Excel. Kutools for Excel : with more than 300 handy Excel add-ins, free to try with no limitation in 30 days.Go to Download After installing Kutools for Excel, please do as this: 1. Select the cells that you want to prevent duplicates, and then click Kutools > Prevent Typing > Prevent Duplicate, see screenshot: 2. And then a prompt box is popped out to remind you if there are Data Validation cells in your selected range, it be removed when applying this feature, see screenshot: 3. Then click Yes button, and a prompt box will pop out as following screenshot shown: 4. Then click OK button, now, when you enter duplicate value in the specified column, a warning box will pop out, see screenshot: If you have a list of data in a worksheet with unique values and duplicate values, and you do not only want to count the frequency of duplicate values also want to know the order of the occurrence of the duplicate values. In Excel, the COUNTIF function can help you count the duplicate values.
Count the frequency of duplicates in ExcelIn Excel, you can use COUNTIF function to count the duplicates. Select a blank cell adjacent to the first data of your list, and type this formula =COUNTIF($A$2:$A$9, A2) (the range $A$2:$A$9 indicates the list of data, and A2 stands the cell you want to count the frequency, you can change them as you need), then press Enter, and drag the fill handle to fill the column you need. See screenshot: Tip: If you want to count the duplicates in the whole Column, use this formula =COUNTIF(A:A, A2) (the Column A indicates column of data, and A2 stands the cell you want to count the frequency, you can change them as you need). Quickly select and count all duplicate/unique values from a column in ExcelIn general, we can remove duplicates from a list easily by Data > Remove Duplicates in Excel. But how to select duplicate/unique values, or count them from a column? And what if selecting or counting duplicate/unique except the first duplicate one? Try Kutools for Excel’s Select Duplicate & Unique Cells utility! Free Trial 30 Kutools for Excel - Includes more than 300 handy tools for Excel. Full feature free trial30 -day, no credit card required! Get It NowCount the order of occurrence of duplicates in ExcelBut if you want to count the order of the occurrence of the duplicates, you can use the following formula. Select a blank cell adjacent to the first data of your list, and type this formula =COUNTIF($A$2:$A2,A2) (the range $A$2:$A2 indicates the list of data, and A2 stands the cell you want to count the order, you can change them as you need), then press Enter, and drag the fill handle to fill the column you need. See screenshot: Count and select all duplicates in a column with Kutools for ExcelSometimes you may want to count and select all duplicates in a specified column. You can get it done easily with Kutools for Excel’s Select Duplicates & Unique Cells utility. Kutools for Excel - Includes more than 300 handy tools for Excel. Full feature free trial30 -day, no credit card required! Free Trial Now!1. Select the column or list that you will count all duplicates, and click the Kutools > Select > Select Duplicates & Unique Cells. 2. In the opening Select Duplicate & Unique Cells dialog box, check the Duplicates (Except 1st one) option or All duplicates (Including 1st one) option as you need, and click the Ok button. And then you will see a dialog box comes out and shows how many duplicates are selected, and at the same time duplicates are selected in the specified column. Note: If you want to count all duplicates including the first one, you need to check the All duplicates (Including 1st one) option in the Select Duplicate & Unique Cells dialog box. 3. Click the OK button. Kutools for Excel - Includes more than 300 handy tools for Excel. Full feature free trial30 -day, no credit card required! Get It NowCount occurrences of each duplicate in a column with Kutools for ExcelKutools for Excel’s Advanced Combine Rows utility can help Excel users to batch count the occurrences of each items in a column (the Fruited Column in our case), and then delete the duplicate rows based on this column (the Fruit Column) easily as below: Kutools for Excel - Includes more than 300 handy tools for Excel. Full feature free trial30 -day, no credit card required! Free Trial Now!1. Select the table containing the column where you will count each duplicate, and click Kutools > Content > Advanced Combine Rows. 2. In the Advanced Combine Rows, select the column you will count each duplicate and click Primary Key, next select the column you will put counting results in and click Calculate > Count, and then click the OK button. See screenshot: And now it has counted the occurrence of each duplicate in the specified column. See screenshot: Kutools for Excel - Includes more than 300 handy tools for Excel. Full feature free trial30 -day, no credit card required! Get It NowDemo: count duplicate values in a column in Excel by Kutools for ExcelKutools for Excel includes more than 300 handy tools for Excel, free to try without limitation in 30 days. Download and Free Trial Now! Relative Articles:Count merged cells in Excel Count blank cells or nonblank cells in a range in Excel The Best Office Productivity ToolsKutools for Excel Solves Most of Your Problems, and Increases Your Productivity by 80%
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Oldest First Sort comments by Oldest First Newest First Comments (57) No ratings yet. Be the first to rate! Adnan Khan about 8 years ago #12332 This comment was minimized by the moderator on the site easy and good one :D Reply 0 0 Priyanka about 8 years ago #12542 This comment was minimized by the moderator on the site Is there any other function or way to calculate the same..?? Because countif() slows down the functioning of the sheet. Please suggest. Reply 0 0 Amol Chopade Priyanka about 8 years ago #12543 This comment was minimized by the moderator on the site More use of functions and formulas make worksheet slower. There is no method to solve it even i suggest you to use special paste option after using formulas and functions. It will solve your problem. Just use it "Alt+s+e+v". :-) Reply 0 0 Ankit Priyanka about 8 years ago #12544 This comment was minimized by the moderator on the site contact me @@ if u want stop duplicacy!! * conditional formating duplicate Reply 0 0 Zana about 8 years ago #12654 This comment was minimized by the moderator on the site Awesome, it's easy and useful. Thaks Reply 0 0 munish about 8 years ago #12677 This comment was minimized by the moderator on the site easy and helpful in large working Reply 0 0 Gaurav Pahuja about 8 years ago #13046 This comment was minimized by the moderator on the site easy to use and helpful..:-p Reply 0 0 Ajeet singh about 8 years ago #13306 This comment was minimized by the moderator on the site Impotent work if duplicate value. Reply 0 0 NAVEEN about 7 years ago #13445 This comment was minimized by the moderator on the site hI In sheet1 we have three columns, 1st columns "fruits names" 2nd column Date of received, Name of supplies only to supplies and in 3rd 4th 5th columns are Normal defect, Major defects and Critical defects,all these in 1st sheet. in 2nd sheet, 3rd sheet, 4th sheet, saparetly post all of Normal defects in 2nd sheet, Major defects in 3rd sheet, critical defects in 4th sheet. when we are updating these sheet it automatically should update 1st individual in normal, Major, Critical. Thanks Naveen Reply 0 0 NAVEEN about 7 years ago #13446 This comment was minimized by the moderator on the site i had query regarding for eg: 1st sheet of work book 1st is column is with data received fruits, 2nd column is fruits names, 3rd column is for normal defects, 4th column is for Major Defects, 5th column is for Critical defects 2nd sheet for Normal Defects, 3rd sheet for Major Defects, 4th sheet for Critical Defects, My query is when we are updating these above sheet it total count should be reflected in 1st by individual fruits and for individual defects. Regards, Naveen kumar Reply 0 0 Harrison about 7 years ago #13640 This comment was minimized by the moderator on the site I am trying to label an individual data point as "1"...and if it has a duplicate, it will label the duplicates as "0"...but it would still label at least one of the data points as "1". Example, I could have one PO number on a truck, or multiple. Thanks Reply 0 0 Amol about 7 years ago #13654 This comment was minimized by the moderator on the site suppose there is a column which contains values as GR1, GR2, GR3 and so on..... but some also getting repeated again. how can i get the final count of the item. Like if it reaches to GR29, the the value should show as 29 in the formula cell Reply 0 0 Brice about 7 years ago #13953 This comment was minimized by the moderator on the site If you want to get a sum of duplicate values in a column(without counting the first one), try: =IF(COUNTIF($A$1:$A1,A1)-1>=1,1,0) For example, let's say that you have a same value 5 times. It will count 1 for each of the 4 duplicate values. Then, you just have to get a sum. Reply 0 0 Fujilives about 7 years ago #14047 This comment was minimized by the moderator on the site =COUNTIF($A$1:$A1,A1) This method for finding duplicates is amazing, because it allows you to do a simple filter on the column (just deselect 0 and 1) to show all 'duplicate entries' instead of 'entries that have duplicates'. What I mean by this, is I can then select ALL visible after the filter, and delete the entire rows, and be left with only a single entry of a row containing that item. For MANY projects, this is a fantastic way to filter things down quickly. Reply 0 0 Ash about 7 years ago #14186 This comment was minimized by the moderator on the site Let say I have different number of PO's in column A but some numbers are the same how can I count the total number of PO without including the duplicate number? Reply 0 0 Rupesh Brahme Ash about 5 years ago #14187 This comment was minimized by the moderator on the site use formula =SUMPRODUCT(1/COUNTIF(A1:A1483, A1:A1483&"")) =1/sumproduct(1/countif(range, criteria)) :-) Reply 0 0 man Rupesh Brahme about 2 months ago #40419 This comment was minimized by the moderator on the site Ty so much Reply 0 0 mohammad about 7 years ago #14619 This comment was minimized by the moderator on the site many many thanks :-) Reply 0 0 Khan about 6 years ago #16067 This comment was minimized by the moderator on the site Please help to resolve this issue site ID Supplier Line 12 abc good 12 VV good 12 TT good site ID Supplier Line 12 abc good Required Supplier Name - formula required to show "Multiple Suppliers" as against same site iD and line there are 3 different suppliers. Please help to resolve this issue. Reply 0 0 Stefan about 6 years ago #16647 This comment was minimized by the moderator on the site Thank you SO much for this post its exactly what I needed! Please could you tell me why your formula "=COUNTIF($A$2:$A2,A2)" didn't work as expected in my worksheet until I amended it to "=COUNTIF($A2:$A$2;A2)" ? i.e. switching the absolute references around Thanks in advance Reply 0 0 Najam Ul Hassan about 6 years ago #16812 This comment was minimized by the moderator on the site very nice formula for counting of duplicate. It is very helpful Thanks extend office team Reply 0 0 Rhytha about 6 years ago #17025 This comment was minimized by the moderator on the site I appreciate for the Solution provided. It is very helpful. Reply 0 0 Unni about 6 years ago #17116 This comment was minimized by the moderator on the site Hi, Please help me to solve the below problem =COUNTIFS('Weld Map'!$O$6:$O$7105,"="&F2,'Weld Map'!$V$6:$V$7105,"=Rej*",'Weld Map'!$AL$6:$AL$7105,"=REJ*") I need to count the text "REJ" from columns "V" and "AL" under the criteria of a period between F1 and F2 |
How to duplicate column in Google Sheets
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