March 2025
Intermediate to advanced
308 pages
7h 2m
Italian
Content preview from DuckDB: installazione e avvio
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Capitolo 6. Usare DuckDB con i file JSON
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Nel Capitolo 2 hai imparato a caricare su DuckDB dati in diversi formati: CSV, Parquet, file Excel e database MySQL. Un altro importante formato di file molto diffuso tra gli sviluppatori è JSON (JavaScript Object Notation).
Una delle caratteristiche notevoli di JSON è la sua struttura flessibile e dinamica: non c'è uno schema fisso da seguire e puoi utilizzare coppie chiave/valore dinamiche per rappresentare i tuoi dati. In DuckDB ci sono diverse tecniche che puoi utilizzare per lavorare con i file JSON e per questo motivo JSON merita un capitolo dedicato.
In questo capitolo esamineremo i vari modi in cui puoi caricare i file JSON in DuckDB. Analizzeremo alcuni file JSON con strutture diverse e ti consiglieremo quale funzione utilizzare per caricarli.
Primer su JSON
Questa sezione è una rapida introduzione per coloro che su non conoscono il formato dei file JSON. Se hai già familiarità con JSON, puoi passare direttamente alla sezione successiva.
JSON è un formato di rappresentazione dei dati leggero, facile da leggere e da interpretare per l'uomo e molto efficiente per i computer che lo manipolano e lo generano all'indirizzo . JSON supporta i seguenti tipi di dati:
Oggetto
Stringa
Booleano
Numero
Array
nullo
Le sezioni seguenti approfondiscono ciascuno dei tipi di dati.
Oggetto
Un oggetto è una ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.