I Sistemi di Numerazione (superiori)

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Is a characterbinarytextntextor image expression. Is an integer or bigint expression that specifies where the returned characters start. The numbering is 1 based, meaning that the first character in the expression is 1. If start is less than 1, the returned expression will begin at the first character that is specified in expression.

If start is greater than the number of characters in the value expression, a zero-length expression is returned. Is a positive integer or bigint expression that specifies how many characters of the expression will be returned. If length is negative, an error is generated and the statement is terminated. If the sum of start and length is greater than the number of characters in expressionthe whole value expression beginning at start is returned.

Returns codice ascii binario tabella data if expression is one of the supported character codice ascii binario tabella types. Returns codice ascii binario tabella data if expression is one of the supported binary data types. Il tipo di dati della stringa restituita corrisponde a quello dell'espressione specificata, con le eccezioni descritte nella tabella seguente. The returned string is the same type as the specified expression with the exceptions shown in the table. I valori per start e lenght devono codice ascii binario tabella specificati nel numero di caratteri per i tipi di dati ntextcharo varchar e nei byte per i tipi di dati textimagebinaryo varbinary.

The values for start and length must be specified in number of characters for ntextcharor varchar data types and bytes for textimagebinaryor varbinary data types.

Expression deve essere varchar max o varbinary codice ascii binario tabella quando start o lenght codice ascii binario tabella un valore maggiore di 2. The expression must be varchar max or varbinary max when the start or length contains a value larger than Quando si usano le regole di confronto SC caratteri supplementariciascuna coppia di surrogati in expression viene considerata come un singolo carattere sia da start sia da length.

When using supplementary character SC collations, both start and length count each surrogate pair in expression as a single character. Per altre informazioni, vedere Codice ascii binario tabella and Unicode Support. For more information, see Collation and Unicode Support. In questo esempio viene illustrato come restituire solo una parte di una stringa di caratteri. The following example shows codice ascii binario tabella to return only a part of a character string.

Here is the result set. Di seguito viene illustrato come visualizzare il secondo, il terzo e il quarto carattere della costante stringa abcdef. Here is how to display the second, third, and fourth characters of the string constant abcdef. To run the following examples, you must install the pubs database. I dati di tipo testo vengono restituiti come varchare i dati di tipo immagine vengono restituiti come varbinary.

Questa query eseguita nella tabella dbo. DimEmployee restituisce il cognome in una colonna e l'iniziale del nome nella seconda colonna. DimEmployee table, this query returns the last name in one column with only the first initial in the second column. L'esempio seguente mostra come restituire il secondo, il terzo e il quarto carattere della costante stringa abcdef.

The following example shows how to return the second, third, and fourth characters of the string constant abcdef. Caratteri supplementari coppie di surrogati Supplementary Characters Surrogate Pairs Quando si usano le regole di confronto SC caratteri supplementariciascuna coppia di surrogati in expression viene considerata come un singolo carattere sia da start sia da length. NAME name Initial Initial ThirdAndFourthCharacters ThirdAndFourthCharacters master master m m st st tempdb tempdb t t mp mp model model m m de de msdb msdb m m db db Di seguito viene illustrato come visualizzare il secondo, il terzo e il quarto carattere della costante stringa abcdef.

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