Numbering rows
The simplest application for window functions is numbering rows. Numbering rows allows you to easily fetch the nth row. For example, it would be very difficult to get the 35th row in any given table if you didn't have a column with each row's number.
Latihan ini adalah bagian dari kursus
PostgreSQL Summary Stats and Window Functions
Petunjuk latihan
- Number each row in the dataset.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
SELECT
*,
-- Assign numbers to each row
___ ___ AS Row_N
FROM Summer_Medals
ORDER BY Row_N ASC;