姬靖 2022-01-16 17:46 下联：黄昏亦自，默默是真 “黎明即起，孜孜为善”的意思是：黎明即将来临开发者_StackOverflow，勤勉才是正确的方式，告诉人们要珍惜时光。“黄昏亦自，默默是真”的意思是：黄昏时分世
Is there a way to define a couple of fields as unique in Django? I have a table of volumes (of journals) and I don\'t want more then one volume number for the same journal.
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