Guida All'uso Di Sql 2026: Dalle basi per principianti alle query sicure, alle modifiche più affidabili e a tutto ciò che sta nel mezzo
Paperback
Publisher: Independently Published
Published: Jun 29 2026
Pages: 162
Weight: 0.86
Height: 0.35 Width: 8.50 Depth: 11.00
Language: Italian
- Impara le basi di SQL che contano davvero: comprendi tabelle, righe, colonne, chiavi, relazioni, schemi e dialetti SQL senza perderti nella teoria.
- Scrivi query SELECT migliori: scegli le colonne, rinomina i risultati, filtra le righe, ordina l'output, limita i risultati e comprendi l'ordine che SQL segue durante l'esecuzione di una query.
- Gestisci dati disordinati con sicurezza: lavora con testo, numeri, date, valori booleani, valori NULL, logica CASE e funzioni di pulizia comuni.
- Unisci le tabelle nel modo corretto: utilizza INNER JOIN, LEFT JOIN, RIGHT JOIN e FULL JOIN, evitando righe duplicate, corrispondenze errate e moltiplicazioni di righe.
- Crea report utili: usa COUNT, SUM, AVG, MIN, MAX, GROUP BY e HAVING per trasformare i dati grezzi in riepiloghi leggibili e metriche aziendali.
- Struttura in modo chiaro le query avanzate: utilizza subquery ed espressioni di tabella comuni per suddividere la logica complessa in parti leggibili e riutilizzabili.
- Utilizzate le funzioni finestra in modo pratico: applicate ROW_NUMBER, RANK, DENSE_RANK, totali progressivi, medie mobili e confronti tra righe per un'analisi più approfondita.
- Modifica i dati in modo sicuro: utilizza le operazioni INSERT, UPDATE, DELETE, le transazioni, COMMIT e ROLLBACK, eseguendo controlli di sicurezza prima di apportare modifiche permanenti.
- Migliora le prestazioni e risolvi gli errori: comprendi indici, vincoli, piani di esecuzione, autorizzazioni, rischi di SQL injection e messaggi di errore comuni.
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