如何在变化的表中找不到不同的行

I have a table of millions of rows that is constantly changing(new rows are inserted, updated and some are deleted). I'd like to query 100 new rows(I haven't queried before) every minute but these rows can't be ones I've queried before. The table has a about 2 dozen columns and a primary key. I have a table of millions of rows that is cons