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Default formulas for data validation

Hi

I want to create a formula for a data validation.

I must not be able to enter a ticket number that already exists in my
database in a specific column.

Regards,

Luke

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Default formulas for data validation

=COUNTIF(A:A,A2)=0

where a2 is the DV cell

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"Luke" wrote in message
...
Hi

I want to create a formula for a data validation.

I must not be able to enter a "ticket number" that already exists in my
database in a specific column.

Regards,

Luke



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Posts: 4,339
Default formulas for data validation

=COUNTIF(A:A,A1)<=1

"Bob Phillips" wrote:

=COUNTIF(A:A,A2)=0

where a2 is the DV cell

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"Luke" wrote in message
...
Hi

I want to create a formula for a data validation.

I must not be able to enter a "ticket number" that already exists in my
database in a specific column.

Regards,

Luke




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Posts: 10,593
Default formulas for data validation

oops! I think I was thinking of comparing back up.

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"Toppers" wrote in message
...
=COUNTIF(A:A,A1)<=1

"Bob Phillips" wrote:

=COUNTIF(A:A,A2)=0

where a2 is the DV cell

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"Luke" wrote in message
...
Hi

I want to create a formula for a data validation.

I must not be able to enter a "ticket number" that already exists in

my
database in a specific column.

Regards,

Luke






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