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Meta
Category Archives: Oracle
Microsoft Query – Oracle Alias
Nel caso si voglia specificare agli alias in una query Oracle in Microsoft Query si può agire nel registro di sistema di windows, per evitare l’errore “ORA-00923: parola chiave FROM non trovata dove prevista” Per maggiorni dettagli: http://support.microsoft.com/kb/259347
Posted in Oracle, Programming Languages, Structured Query Language
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Oracle Like Escape
I caratteri “%” e “_” sono utilizzati nella sintatti SQL del comando LIKE di Oracle come caratteri jolly. Se si vogliono utilizzare come valori nel filtro, è necessario specificare la clausola Escape. Es: Per maggiori dettagli: http://www.adp-gmbh.ch/ora/sql/like.html
Posted in Database, Oracle, Structured Query Language
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Oracle NVL Functions
NVL è un utile funzione Oracle che consente di sostituire NULL con una stringa. Sintassi NVL(expr1, espr2) Se expr1 è nullo, poi ritorna NVL espr2. Se espr1 non è nullo, poi ritorna espr1. Alcuni esempi: Per maggiori dettagli http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions105.htm
Posted in Database, Oracle, Structured Query Language
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Oracle query ricorsiva – gerarchica
Posted in Database, Oracle, Structured Query Language
Tagged query gerarchiche, query ricorsive
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UID della sessione Oracle corrente
Posted in Database, Oracle, Structured Query Language
Tagged PLSQL, sessione corrente
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Forzare l’utilizzo di un indice in query SQL Oracle
Posted in Database, Oracle, Structured Query Language
Tagged index, indice oracle
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