Guida Pratica A Sql 2026: Dalle prime query a report affidabili, flussi di lavoro dei dati puliti e oltre
Paperback
Publisher: Independently Published
Published: Jun 29 2026
Pages: 198
Weight: 1.04
Height: 0.42 Width: 8.50 Depth: 11.00
Language: Italian
- Inizia con una mentalità SQL: comprendi tabelle, righe, colonne, chiavi, relazioni e come i database organizzano le informazioni prima di scrivere query complesse.
- Imposta tutto correttamente: scegli un ambiente di pratica, carica dati di esempio, esegui le query in modo sicuro e acquisisci abitudini che ti evitino la frustrazione tipica dei principianti.
- Scrivi query SELECT più pulite: recupera le colonne, rinomina l'output, filtra le righe, ordina i risultati, limita i dati e struttura query di facile lettura.
- Gestisci problemi reali con i dati: lavora con testo, numeri, date, campi calcolati, ricerche di pattern, valori NULL ed errori logici che causano risultati errati.
- Unisci le tabelle con sicurezza: utilizza join interni, join a sinistra, join tra più tabelle e join automatici, evitando duplicati, righe mancanti e corrispondenze errate.
- Crea report accurati: usa COUNT, SUM, AVG, MIN, MAX, GROUP BY e HAVING per creare riepiloghi affidabili.
- Scomponi la logica complessa: usa subquery, tabelle derivate, CTE e la scomposizione delle query passo passo per risolvere problemi più grandi senza perderti
- Utilizza le funzioni finestra: applica classifiche, totali progressivi, medie mobili, partizioni e confronti tra righe per un'analisi pratica.
- Modifica i dati in modo sicuro: impara a utilizzare le operazioni di INSERT, UPDATE, DELETE, le transazioni, i rollback, i vincoli e le buone pratiche di test prima di modificare i record.
- Risolvi i problemi come un utente esperto: diagnostica query lente, risultati errati, righe duplicate, dati mancanti ed errori comuni in PostgreSQL, MySQL, SQL Server e SQLite.
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