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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. The Null value indicates that the Variant contains no valid data.
The IsNull() function checks whether an expression contains Null (no data). This function returns a Boolean value. TRUE (-1) indicates that the expression is a Null value, and FALSE (0) indicates that the expression is not a Null value.
This MSAccess tutorial explains how to use the Access IsNull function with syntax and examples. The Microsoft Access IsNull function returns TRUE if the expression is a null value. Otherwise, it returns FALSE.
11 lut 2020 · In SQL Server we can use IsNull() function to check whether expression value is null or not. For ex. Select IsNull(sum(amount),0) as TotalAmount From Payments
Return TRUE if the expression is NULL, otherwise return FALSE. Syntax IsNull (expression) Key expression A string or numeric expression. The IsNull () function can be used in VBA or in an SQL query. MS Access makes a distinction between an empty string "" and a NULL value.
6 mar 2003 · Use Is Null and Is Not Null in criteria expressions and IsNull() in VBA code to find Null values before they work their way into your application with unexpected and often negative...
15 sie 2023 · Generally speaking, the Is Null statement will perform better than the IsNull() function, so you should use it whenever it is available to you. This includes: In Queries; In the Control Source property of form and report controls; Within the Eval() function; For more information, refer to this article:
