ms access - How to have at most n number of duplicates in a field -


my question unique assume. wants rid of duplicates, me on other hand, want allow specified number of duplicates appear.

i'm creating database reserving dates blood donation campaigns.

my database consists of

  1. date of campaign,
  2. name of organizer,
  3. contact info & venue.

additionally every campaign unique id number. catch is, can accommodate 5 campaigns per day, is: date column should allowed have @ 5 duplicates

any ideas on how can achieved?

if entering information directly table within access 2010 can add following before change data macro table:

beforechange.png

for more information on data macros see

create data macro


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