IsNull returns True if expression is Null; otherwise, IsNull returns False. If expression consists of more than one variable, Null in any constituent variable causes True to be returned for the entire expression.

In Microsoft SQL Server 2008, you run a query that uses the ISNULL () function to select values that are in a nullable column. The table that contains the nullable column is joined with another table at the …

Description Each of these functions, referred to collectively as the IS functions, checks the specified value and returns TRUE or FALSE depending on the outcome. For example, the ISBLANK function …

Sometimes you need to check if a cell is blank, generally because you might not want a formula to display a result without input.

IsNull devolve Verdadeiro se a expressão for nula; caso contrário, IsNull devolve False. Se a expressão for composta por mais de um variável, Nulo em qualquer variável constituinte fará com que …

重要: 使用 IsNull 函数确定表达式是否包含 Null 值。 在某些情况下（例如， If Var = Null 和 If Var <> Null）可能预期计算结果为 True 的表达式始终为 False。

Jan 1, 2000 · This article explains how to create conditional (also known as Boolean) expressions in Access. A conditional expression evaluates to either true or false, and it then returns a result that …

IsNull restituisce True se espressione è Null; in caso contrario, IsNull restituisce False. Se l'espressione è costituita da più variabile, null in una variabile costituente restituisce True per l'intera espressione.

varResult = IIf(IsNull(varFreight), _ "No Freight Charge", varFreight) In the next example, the optional argument supplied to the Nz function provides the string to be returned if varFreight is Null. varResult …

重要: 使用 IsNull 函式來判斷運算式是否包含 Null 值。 在某些情況下，您可能預期評估為 True 的運算式 （例如 If Var = Null 和 If Var <> Null） 一律為 False。

Belangrijk: Gebruik de functie IsNull om te bepalen of een expressie een Null -waarde bevat. Expressies waarvan u zou verwachten dat het resultaat True is onder bepaalde omstandigheden, zoals If Var = …