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.
Questo esercizio fa parte del corso
PostgreSQL Summary Stats and Window Functions
Istruzioni dell'esercizio
- Number each row in the dataset.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
SELECT
*,
-- Assign numbers to each row
___ ___ AS Row_N
FROM Summer_Medals
ORDER BY Row_N ASC;