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Is the expression returned if no comparison operation evaluates to TRUE. Valuta un elenco di condizioni e restituisce una tra più espressioni di risultato possibili. when_expression è qualsiasi espressione valida.when_expression is any valid expression. For example, the following query produces a divide by zero error when producing the value of the MAX aggregate. SQL Server allows for only 10 levels of nesting in CASE expressions. Nell'esempio seguente viene visualizzato il prezzo di listino come commento di testo in base alla fascia di prezzi per un prodotto.The following example displays the list price as a text comment based on the price range for a product. When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours. the value in the ELSE clause. ELSE else_result_expressionELSE else_result_expression Questa condizione si presenta prima della valutazione dell'espressione CASE.This occurs prior to evaluating the CASE expression. Con l'espressione CASE è possibile valutare in sequenza le relative condizioni e viene arrestata alla prima condizione soddisfatta.The CASE expression evaluates its conditions sequentially and stops with the first condition whose condition is satisfied. Nell'esempio seguente viene utilizzata l'espressione CASE in un'istruzione UPDATE per determinare il valore impostato per la colonna VacationHours per i dipendenti per cui SalariedFlag è impostato su 0.The following example uses the CASE expression in an UPDATE statement to determine the value that is set for the column VacationHours for employees with SalariedFlag set to 0. Returns the highest precedence type from the set of types in result_expressions and the optional else_result_expression.

CASE can be used in any statement or clause that allows a valid expression. The OUTPUT clause is used to display the before and after vacation values. Both formats support an optional ELSE argument. WHEN when_expressionWHEN when_expression The searched CASE expression evaluates a set of Boolean expressions to determine the result. When a value does not exist, the text "Not for sale' is displayed. However, if City is NULL, then order by Country: If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. Entrambi i formati supportano un argomento facoltativo ELSE.Both formats support an optional ELSE argument. Espressione booleana valutata quando viene utilizzato il formato CASE avanzato.Is the Boolean expression evaluated when using the searched CASE format. In alcune situazioni, un'espressione viene valutata prima che in un'espressione CASE vengano ricevuti i risultati dell'espressione come input.In some situations, an expression is evaluated before a CASE expression receives the results of the expression as its input. Ad esempio, nella query seguente si verifica un errore di divisione per zero durante la generazione del valore dell'aggregazione MAX. Within a SELECT statement, the searched CASE expression allows for values to be replaced in the result set based on comparison values. The simple CASE expression operates by comparing the first expression to the expression in each WHEN clause for equivalency. The simple CASE expression compares an expression to a set of simple expressions to determine the result. If no conditions are true, it returns Si applica a:Applies to: SQL ServerSQL Server (tutte le versioni supportate) SQL ServerSQL Server (all supported versions) database SQL di AzureAzure SQL Databasedatabase SQL di AzureAzure SQL Database Istanza gestita di SQL di AzureAzure SQL Managed InstanceIstanza gestita di SQL di AzureAzure SQL Managed Instance Azure Synapse AnalyticsAzure Synapse AnalyticsAzure Synapse AnalyticsAzure Synapse Analytics Parallel Data WarehouseParallel Data WarehouseParallel Data WarehouseParallel Data WarehouseSi applica a:Applies to: SQL ServerSQL Server (tutte le versioni supportate) SQL ServerSQL Server (all supported versions) database SQL di AzureAzure SQL Databasedatabase SQL di AzureAzure SQL Database Istanza gestita di SQL di AzureAzure SQL Managed InstanceIstanza gestita di SQL di AzureAzure SQL Managed Instance Azure Synapse AnalyticsAzure Synapse AnalyticsAzure Synapse AnalyticsAzure Synapse Analytics Parallel Data WarehouseParallel Data WarehouseParallel Data WarehouseParallel Data Warehouse.

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