i have programe where i use serial number for each document number. now i want to start serial number with one againe in new financial year, but restarting number with one result in duplication of reference number in database. how to get this.

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You can create a year table where you can store the year as 2010,2011,2012 and so on and use the id of the year in your transaction table. When year will change u can easily start the serail number again with 1 and it will also not create any duplicacy as serial number will be associated with the year ID.

thanks

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