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16 lip 2010 · you can use the following code to check whether {% if var is defined %} var is variable is SET {% endif %}
Definition and Usage. The is_null () function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.
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.
14 paź 2016 · SELECT MOCK_DATA.ISBN, MOCK_DATA.Book_Edition, MOCK_DATA.Book_name FROM MOCK_DATA WHERE (((MOCK_DATA.Book_name) Like "*" & [Forms]![Search]![Title] & "*") AND ((IsNull([Forms]![Search]![Edition]))=False) AND (([Forms]![Search]![Edition])=[Book_Edition])) OR (((MOCK_DATA.Book_name) Like "*" & [Forms]![Search]![Title] & "*") AND ((IsNull([Forms ...
I need to check if value is defined as anything, including null. isset treats null values as undefined and returns false. Take the following as an example: $foo = null; if(isset($foo)) // returns false. if(isset($bar)) // returns false. if(isset($foo) || is_null($foo)) // returns true.
Try: NZ (MaritalStatus,"SINGLE") From Nz Function in the documentation: You can use the Nz function to return zero, a zero-length string (" "), or another specified value when a Variant is Null.
