#### Database functions to find unique entries on a date.

```Hi All

I have some data as shown below in an Excel worksheet. Date and name -
each in seperate columns:

Date  Name
1/1/8  Chris
1/1/8  Sam
1/1/8  Chris
1/1/8  Dave
1/1/8  Chris

I am using database functions (i.e DCOUNTA etc) to analyse this data.

However I cannot work out how to calculate the number of unique names
on a date.

That is, from the above data the answer I want for 1/1/8 is 3 (Chris,
Sam & Dave).

Does anyone have any clues for me how I can use database functions
(DCOUNTA etc) to arrive at this answer? The names are dynamic and will
vary all the time so I cannot just count known names on a day.

Cheers for any ideas,
Chrisso
```
 0
12/6/2008 9:35:07 AM
excel 39879 articles. 2 followers.

2 Replies
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```On 6 joulu, 11:35, Chrisso <chris75sut...@gmail.com> wrote:
> Hi All
>
> I have some data as shown below in an Excel worksheet. Date and name -
> each in seperate columns:
>
> Date =A0Name
> 1/1/8 =A0Chris
> 1/1/8 =A0Sam
> 1/1/8 =A0Chris
> 1/1/8 =A0Dave
> 1/1/8 =A0Chris
>
> I am using database functions (i.e DCOUNTA etc) to analyse this data.
>
> However I cannot work out how to calculate the number of unique names
> on a date.
>
> That is, from the above data the answer I want for 1/1/8 is 3 (Chris,
> Sam & Dave).
>
> Does anyone have any clues for me how I can use database functions
> (DCOUNTA etc) to arrive at this answer? The names are dynamic and will
> vary all the time so I cannot just count known names on a day.
>
> Cheers for any ideas,
> Chrisso

=3DSUM(IF(FREQUENCY(IF(LEN(A2:A11)>0;MATCH(A2:A11;A2:A11;0);""); IF(LEN
(A2:A11)>0;MATCH(A2:A11;A2:A11;0);""))>0;1))

would do the trick as an array function (Ctrl + Shift + Enter)
```
 0
12/6/2008 10:32:42 AM
```Assumed Col B has no spaces then use

=IF(A2:A6=DATE(2008,1,1),SUM(1/COUNTIF(B2:B6,B2:B6)))  ( use ctrl +
shift + enter )

Chrisso wrote:

> Hi All
>
> I have some data as shown below in an Excel worksheet. Date and name -
> each in seperate columns:
>
> Date  Name
> 1/1/8  Chris
> 1/1/8  Sam
> 1/1/8  Chris
> 1/1/8  Dave
> 1/1/8  Chris
>
> I am using database functions (i.e DCOUNTA etc) to analyse this data.
>
> However I cannot work out how to calculate the number of unique names
> on a date.
>
> That is, from the above data the answer I want for 1/1/8 is 3 (Chris,
> Sam & Dave).
>
> Does anyone have any clues for me how I can use database functions
> (DCOUNTA etc) to arrive at this answer? The names are dynamic and will
> vary all the time so I cannot just count known names on a day.
>
> Cheers for any ideas,
> Chrisso
```
 0
12/6/2008 2:51:51 PM

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