April 2025
Beginner to intermediate
570 pages
12h 7m
Italian
Content preview from SQL Cookbook, 2a edizione
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Capitolo 8. Aritmetica della data
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Questo capitolo introduce le tecniche per eseguire semplici operazioni aritmetiche sulle date. Le ricette coprono operazioni comuni come aggiungere giorni alle date, trovare il numero di giorni lavorativi tra le date e trovare la differenza tra le date in giorni.
Essere in grado di manipolare le date con le funzioni integrate del tuo RDBMS può migliorare notevolmente la tua produttività. Per tutte le ricette di questo capitolo, cerchiamo di sfruttare le funzioni integrate di ogni RDBMS. Inoltre, abbiamo scelto di utilizzare un unico formato di data per tutte le ricette, GG-MON-AAAA. Ovviamente esistono altri formati comunemente utilizzati, come DD-MM-YYYY, il formato standard ISO.
Abbiamo scelto di standardizzare il formato GG-MON-AAAA per favorire coloro che lavorano con un RDBMS e vogliono imparare gli altri. Vedere un formato standard ti aiuterà a concentrarti sulle diverse tecniche e funzioni fornite da ogni RDBMS senza doverti preoccupare dei formati di data predefiniti.
Suggerimento
Questo capitolo si concentra sull'aritmetica di base dei datteri. Troverai ricette più avanzate sulle date nel capitolo successivo. Le ricette presentate in questo capitolo utilizzano tipi di dati semplici. Se utilizzi tipi di dati più complessi, dovrai adattare le soluzioni di conseguenza.
8.1 Aggiungere e sottrarre giorni, ...
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