It is no exaggeration that knowing excel formulas can give you a career boost. From someone starting at the long list of numbers, you can become a data god who can lookup, manipulate and analyze any spreadsheet by learning few excel formulas.
So when our little excel blog hit the 5000 RSS Subscriber milestone, I celebrated the occasion by asking you to share an excel formula through twitter or comments with rest of us. And boy, what an excellent list of formula tips you have shared with us all.
Here is the complete list of entries for the twitter formula contest.
Follow the links next to contributor’s name to see the original twitter post or comment
To return the full Path+Filename of your (saved) workbook
by Dmurphy on PHD comments
To return the full Path+Filename of your (saved) workbook (and dropping the [] characters) to get, for example, C:\Data\ExcelFiles\MyWorkbook.xls: =SUBSTITUTE(SUBSTITUTE(LEFT(CELL(”filename”,$A$1), FIND(”]”,CELL(”filename”,$A$1))),”[“,””),”]“,””)
Create a Dynamic Range that Grows and Shrinks with Data
by ps62 on twitter [@ps62]
IF($A6=””,””, SUM(OFFSET(Data,$A6-1,StartDateIndex-1,1,NumCols))) – makes stuff dynamic
Find the last cell in a row
by govi on twitter [@govi]
Return last filled cell in a row: =LOOKUP(9,999E+307;A1:IV1)
Cleaning your data (Example, changing the values in a column)
by artjohnson on twitter [@artjohnson]
Excel. Cust name header in C9 and text datalist below. Formula in B9 moves name from C9 to B9. Copy down. =if(isblank(C8),c9,b8)
Extract the month from a date
by Alan on PHD comments
Probably a easier way of doing this , extracting the month from a date as text. A1 is date =TEXT(DATE(0,MONTH(a1),1),”mmmm”)
Clean your text before you lookup
by rushikul on twitter [@rushikul]
=VLOOKUP(CLEAN(TRIM(E20)),F5:G18,2,0). To make sure you are using clear text, as text is most used in vookup_value
Find if two ranges are statistically different
by nandoaires on twitter [@nandoaires]
=IF((1-(1-NORMSDIST(ABS(A1-A2)/SQRT((2*AVERAGE(A1:A2)*(1-AVERAGE(A1:A2)))/(A3))))*2)>0,95;”Different”;”Equals”)
Lookup 3 criteria and return the match
by Alan_xls on twitter [@Alan_xls]
=Index(return,Match(1,(1stRange=criteria1)*(2ndRange=criteria2)*(3rdRange=criteria3),0)) Return result where 3 values match,Array Form
Offset with Match, get data from somewhere else
by Arnab Bose on PHD comments
This formula looks up data from another sheet considering three parameters keeping into account the column A and column B with sub-components (both on another sheet) and matching them up with the heading on both sheets. =OFFSET(’Data Sheet’!$C$1,MATCH(D$2,’Data Sheet’!$A$2:$A$140,0)+MATCH($B5,’Data Sheet’!$B$2:$B$20,0)-1,MATCH(D$3,’Data Sheet’!$C$1:$J$1,0)-1)
Using SUM with multiple conditions
by ps62 on twitter [@ps62]
{=SUM(IF(shoes=”nike”,Units,0))} – array formula – two conditions
VLOOKUP but get values from the left
by bsamson on twitter [@bsamson]
VLookup to return values to the left of the lookup range: =INDEX(SearchRange,MATCH(LookupValue,LookupRange,FALSE))
Getting data from a dynamic range
by Arnab Bose on PHD comments
This formula extracts data from a dynamic data range and returns a zero value if there is an #N/A error. =IF(ISNA(HLOOKUP($A14,Data!$AB$2:$AW$9,MATCH(”P”,Data!$AB$2:$AB$2,0),0)), 0,HLOOKUP($A14,Data!$AB$2:$AW$9,MATCH(”P”,Data!$AB$2:$AB$2,0),0))
Find the difference between maximums of two ranges
by PreetAulakh on twitter [@PreetAulakh]
{=MAX(K5:M5-K4:M4)}, one step formula to determine the max of difference of two ranges! No curly brackets in excel, Cltr+Shift+Enter
Find the top 3 values of a range
by JassiAulakh on twitter [@JassiAulakh]
Large(A1:A100,{1,2,3}). Gives you 3 highest values of a range. Select three cells and enter this formulas. Then Cltr+Shift+Enter
SUMPRODUCT with multiple conditions
by Martin on PHD comments
Here’s my little contribution (previously posted 😉 Named Ranges (should be dynamic, but….) Ship $A$2:$A$8 Captain $B$2:$B$8 flights $C$2:$C$8 in F:F Summary_ship $F$2:$I$2 this 3:3 Summary_Captain $E$3:$E$6 data is in range A1:C8, and summary is in E1:I6. =SUMPRODUCT((Ship=in Summary_ship)*(Captain=this Summary_Captain)*(flights))
Get the name of the workbook
by Dmurphy on PHD comments
To return the name of the workbook only, e.g. MyWorkbook.xls: =MID(CELL(”filename”,$A$1),FIND(”[“,CELL(“filename”,$A$1))+1,FIND(“]“,CELL(”filename”,$A$1))-FIND(”[”,CELL(”filename”,$A$1))-1)
Excel Formula Fun – Should we fight… ?
by chrismelck on twitter [@chrismelck]
=IF(ISERROR(VLOOKUP(WOMD,Iraq,1,FALSE)),”Declare war”,”Declare war anyway”)
More ways to use IF and Then formula
by Olu D. on PHD comments
This formula determines the Active (=”T”) status or otherwise of Employees in an Excel spreadsheet: =IF(AC2=””,”X”,IF(AND(AC2=500000,AD2=””),”T”,IF(AND(AC2500000,AD2?”),”F”,”Pls Enter Leaving Reason!!”)))
Using INDIRECT along with VLOOKUP to make dynamic lookups
by squash86 on twitter [@squash86]
=VLOOKUP(B3, INDIRECT(B36), COLUMN()-1,FALSE) The INDIRECT returns the name of a named range that holds the data table.
Calculate the p-value of a t-statistic [Don’t ask me what it is 😛 ]
by David on PHD comments
=NORMDIST(-1*ABS((Z27-AE27)/AG27),0,1,TRUE). Calculate p-value for t-statistic based on means in Z27 and AE27 and the std err of mean in AG27.
What is on the right side of that string
by aniVy on twitter [@aniVy]
=RIGHT(A1,LEN(A1)-FIND(“-“,A1,1)) – Extracts right side string after a hyphen.
Find frequency distribution of a range of values
by Cody on PHD comments
=FREQUENCY(DY5:DY118,EU4:EU14) for creating frequency distributions. I can’t believe I went so long before discovering that there’s an easy built-in array function that does this. Constructing the distribution by hand was always a pain.
In-cell bar graph
by JohnCorp on twitter [@JohnCorp]
=REPT(“|”,A1/MAX($A$1:$A$5)*30) creates a bar graph from the data in the range a1:a5, change the font to change the look of the graph
Get the name of the current worksheet
by Dmurphy on PHD comments
To return the name fo the current worksheet, e.g. “Sheet1?: =MID(CELL(”filename”,$A$1),FIND(”]”,CELL(”filename”,$A$1))+1, LEN(CELL(”filename”,$A$1))-FIND(”]”,CELL(”filename”,$A$1)))
Excel formula fun – Usetheforce()
by _mikii on twitter [@_mikii]
=usetheforce(choke,”Moff Jerjerrod”)
UDF to calculate to royalty, I am not getting any
by chrislbs on twitter [@chrislbs]
=TieredRoyalty($R$16:$T$19,I5) @r1c1 Uses a UDF to calculate royalty on I5 based on a TierTable in R16:T19, saving nested vlookups
Find the Next Friday the 13th
by S3bast1an on twitter [@S3bast1an]
ARRAYformula – Next Friday 13th is =MIN(IF(((WEEKDAY(TODAY()+ROW(1:1000);2)=5)*(DAY(TODAY()+ROW(1:1000))=13))=1;TODAY()+ROW(1:1000)))
Split first name and last name
by Mahmut on PHD comments
=LEFT(A1,FIND(” “,A1)-1) =RIGHT(A1,LEN(A1)-FIND(” “,A1)) Split first names and last names.
IF with a VLOOKUP
by m4th1337 on twitter [@m4th1337]
=IF(VLOOKUP(C1,’Historical Data’!$A$2:$S$332,4,FALSE)>F1,”-“,IF(VLOOKUP(C1,’Historical Data’!$A$2:$S$332,4,FALSE)
And now for the winners
I wish I had more prizes to give. All the tips are truly marvelous. I have learned several cool uses of excel formulas. But alas, we have only 2 prizes in this contest.
Dashboard bundle from Bonavista Systems goes to Govi
The excel formulas 2007 book by John Walkenbach goes to DMurphy
Both the winners are randomly selected. I have already sent them an e-mail with the further instructions to claim the prizes.
Big thank you to Bonavista Systems, the contest sponsor
I would like to thank Andreas from Bonavista systems for sponsoring the dashboard bundle. Bonavista systems makes some really cool tools for excel dashboards, spark-lines and helps you make cleaner and better looking charts. Checkout their products and know more about them from their site.
Further Resources if you want to learn Excel Formulas
42 Responses to “Prevent Duplicate Data Entry using Cell Validations”
Hi Chandoo, I need you help in the following problem.
I'm trying to get a direccion from a found result. With this dirreccion I will want the before cell value. For example, If result of a find is 38 localized in cell $C$2, I need to get previus value (cell $B$2 ), maybe Andrés.
Do you know some way to do that?
Thank you for you help.
Hi Chandoo
Thanks for this. One thing though: In my pre-2007 version of Excel, the COUNTIF function doesn't recognise a semicolon (;), but requires a comma.
Is the semicolon an Excel 2007 thing?
Jair... I am not sure I understand what you want. what do you mean by Dirreccion?
@Lincoln: I am sorry, often I forget that I am using European version of excel where the delimiter is ; instead of ,. I have corrected the formula now.
Thanks for this nice tip, i used to do a find all after filling every new items which was cumbersome.
Do you know a way to extend this validation search to other tabs/sheets ?
Thanks for you attention. I'm trying to get of value continue from a found value. Let me show a example:
Name Years
John 35
Maria 28
Teresa 32
If I search the max years, the result is 35, but I need that result to be John. Do you know how I can do it?
@Subbu.. you can easily extend the validation to other sheets by pasting the data validations. See the latest article here: http://chandoo.org/wp/2009/10/28/copy-data-validations/
@Jair.. you can use the large() or small() formulas to do this. for eg. =index(A1:A3,large(B1:B3,1)) will get you the name of the person with highest "years". More help here: http://chandoo.org/excel-formulas/large.html
Hi, I don't know if I'm using bad the formula or its performance is diferent for my Office version. Large() formula return the value in the cell, in my example 35. The index() formula use a range, row and column. I'm using the large() as number of row, and it is bad because into the range don't have row 35. This is my perception. What do you think?
Hi, I going to prove, with this solution by JLD http://jldexcelsp.blogspot.com/2008/07/extraer-direccion-de-celda-en-matriz.html
Hello,
I am trying to attempt data validation in Excel Mobile, but the DV tool isnt available. I want to prevent duplicates is all, any advice on acheiving this in Excel Mobile? Thanks..
@Jair... my french aint that good. it starts at "merci" and ends at "beau coup".
Anyhow, you need to merge the large with vlookup to do this. I am not sure if you have solved the problem. Otherwise let me know with details and I can write the formula in comments.
@Chad... I have never used excel mobile, so I have no idea. May be they have not implemented data validations in excel mobile.
Any excel mobile users out there?
Hi Chandoo, the proposed solution by JlD is interesting. He created a macro to get values when the matrix is not one dimensional, how on my problem. This fuction for me.
I would like to share you my work, how can I upload?
@Jair.. sorry for such a delayed reply.. you can upload the files to skydrive and link them here. Or you can email them to me at chandoo.d @ gmail.com and I will upload them somewhere. But it could take forever if you email files to me as I am a bit lazy.
[...] Day 31: Advanced Data Validation Tricks in Excel – Part 2 [...]
Hi,
Can you help me in Microstrategy?
Br,
Moin
really wonderful article. I feel it is implementing Primary Key concept into spreadsheets.
Hi article on data validation. Excel is a very versatile platform to work with and we use it for all kinds of data tabulation. In fact this must have been the most rudimentary data management tools I must have worked with and knowing such tips only adds functuionality to our user experience. Great article. looking forawrd to read more.
Hi Chandoo,
Thanks for such a nice idea.
I tried copy paste the data into the validated area, but the pop-up msg (warning msg) doesn't came. Is it something that we need to update the data manually each time,.
Do we have any option where we can bulk upload the number and it throws a warning message that the data already exits and do we want to continue with this ?
Please do reply me.
Thank you.
Regards,
Vasanth.
It was really useful chandoo...thanks a lot...
Tried this in excel 2010 and it did not work?
Could the newer excel have changed that much?
@Leo
It works fine in Excel 2010
The formula used above =COUNTIF($B$4:$B$11,B4)<=1
only applies to the range B4:B11
Did you adjust the range to your data?
This page helped me accurately to find solution of my question. thanx
we want to prevent duplicate entries in three columns combined, using data validation, i.e. say, column A has first name and Column B has middle name, Column C has last name. the first name can be duplicate, middle name can be duplicate, last name can be duplicate, but not all three at the same time.
I want to prevent duplicate entries in three columns combine, using data validation, i.e. say, column A has first name and Column B has middle name, Column C has last name. the first name can be duplicate, middle name can be duplicate, last name can be duplicate, but not all three at the same time.
Hi, I've tried above validation method to prevent duplicate value from entering into the cells. It's work, when user key in the data into the selected range. However, it's not working when user copy-&-paste the info into the same range.
Please advice. Thanks.
Hi Chandoo,
Does it work in Excel 2007?
Please Reply
thanks chandoo........
it does not work when data is copy pasted...any solution for this??
hi i m shaloo and i want to know in excel if i write duplicate no.then it says or show about we are write duplicate no.
Hi Chandoo
I've tried using this with a Named Range, which is actually a column in a Table as DV wont accept a table reference, and it wont work.
Also tried using Offset to specify the Named Range, but that wont work either.
Is it possible to use Named Ranges with DV?
Thanks
Kris
I have tried the above formula on a table column. The Error box does not pop up, there is only the small ! next to the cell with the duplicate. The column I am working with is formulas that produce a date. Is the reason it doesn't work that the cells contain formulas rather than data?
The formula works but only if I enter data in cell above it. So for example, if I have "123" in B11 it does not allow me to enter "123" in B10, B9, B8, etc. But I can still enter "123" in B12. Please help! 🙂
Great tip.. thanks a lot
I have 21 years of experience working as data entry assistant. I constantly read several blogs to keep myself up-to-date with the advances in data entry profession. I really enjoyed this blog post. From my several years of experience, I agree with you 100% when you say, “ We all know that data validation is a very useful feature in Excel. You can use data validation to create a drop-down list in a cell and limit the values user can enter. ”
Keep blogging. I will come here again.
--data entry assistant
Hi,
This is really very helpful.
Thank you
how can i assign two validation on a single cell
one is for list validation (means the data should be from that range)
second i want to prevent them from repetition
how can i do this ?
P7 to P506 have GR# which are for list
i want to prevent C column to not to repeat and should be from the P column
@Junaid
Can you please post the question in the Chandoo.org Forums
http://forum.chandoo.org/
You have to register to be able to post questions
Please attach a file so that a specific answer can be delivered.
i made an account but there is no option available to post questions ??
where can i ??
@Jubaid
Goto http://forum.chandoo.org/
Goto Ask an Excel Question
Post New thread
Type your question
Attach a file
Please attach a file so that a specific answer can be delivered.
friend can any one tell me the formula
exname location qty
gaurav 1 1
rofan 2 5
sandeep 3 6
gaurav 4 3
rofan 5 4
sandeep 6 8
gaurav 7 9
If this is a data.
if i want a formula by which if i type gaurav then all the location and qty should be shown in a new page.
i had 5,00,000 sku so if i punch one name i can get the entire details
@Gaurav
Can you please post the question at the Chandoo.org Forums
http://forum.chandoo.org/
Please attach a sample file for a quicker more targeted response
IF(ISERROR(INDEX($B$3:$C$9,SMALL(IF($B$3:$B$9=$B$12,ROW($B$3:$B$9)-ROW($C$2)),ROW(A1:C1)),2)),"",INDEX($B$3:$C$9,SMALL(IF($B$3:$B$9=$B$12,ROW($B$3:$B$9)-ROW($C$2)),ROW(A1:C1)),2))
please explain
YOUR COUNTIF FORMULA IS REALLY HELPFUL AND WORKS. I TRIED SEVERAL SITES BUT THEIR FORMULA DOES NOT WORK. ONLY YOU HAVE GIVEN A RIGHT FORMULA!
THANK YOU!!!!!