Excel- Not Allow Column to accept Duplicate data and length of text not more than 28 characters -
i have column in excel, have put 2 data conditioning it.
- for range of cells, should not accept duplicate values.
- for same range of cells, should not allow user enter more 28 character of text length.
- it can allow cell blank.
i tried selecting cell range , go data ->data validation-> allow - custom formula = =and(countif($b:$b,b5)=1,len(b2)<29) not working. formula, allowing enter duplicate data , enter data more 28 characters.
hey please write formula,
=and(countif(b$4:b$20,b4)=1,len(b4)<=28,isnumber(b4+0))

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