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This function returns the number of the current row within its partition.
Row numbers range from 1 to the number of partition rows. It neither requires ORDERBY nor accepts window frame definitions, such as FRAMEROWS and FRAMERANGE.
ROWNUMBER()
// WINDOW(ROWNUMBER())
city | sold | row_number
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Paris 100 1
Berlin 150 2
Moscow 200 3
Rome 200 4
London 300 5