When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours. else_result_expression is any valid expression. The HAVING clause restricts the titles to those that are held by men with a maximum pay rate greater than 40 dollars or women with a maximum pay rate greater than 42 dollars. If there is no ELSE part and no conditions are true, it returns NULL. Valuta un elenco di condizioni e restituisce una tra più espressioni di risultato possibili.Evaluates a list of conditions and returns one of multiple possible result expressions. The following example displays the list price as a text comment based on the price range for a product. Se le espressioni sono equivalenti, viene restituita l'espressione nella clausola THEN.If these expressions are equivalent, the expression in the THEN clause will be returned. Convenzioni della sintassi Transact-SQL Transact-SQL Syntax Conventions. When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours. Evaluates, in the order specified, Boolean_expression for each WHEN clause. 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. result_expression è qualsiasi espressione valida.result expression is any valid expression. The simple CASE expression operates by comparing the first expression to the expression in each WHEN clause for equivalency. In the order specified, evaluates input_expression = when_expression for each WHEN clause. If no Boolean_expression evaluates to TRUE, the Database Engine returns the else_result_expression if an ELSE clause is specified, or a NULL value if no ELSE clause is specified. L'espressione CASE avanzata valuta un set di espressioni booleane per determinare il risultato.The searched CASE expression evaluates a set of Boolean expressions to determine the result. In un'istruzione SELECT l'espressione CASE avanzata consente di sostituire valori nel set di risultati in base ai valori di confronto.Within a SELECT statement, the CASE expression allows for values to be replaced in the result set based on comparison values. You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated sub-queries that return scalars), not for aggregate expressions. Questa condizione si presenta prima della valutazione dell'espressione CASE.This occurs prior to evaluating the CASE expression. In un'istruzione SELECT l'espressione CASE avanzata consente di sostituire valori nel set di risultati in base ai valori di confronto. The following example uses the CASE expression to change the display of product line categories to make them more understandable.

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