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Use : "Select * from testtable where (a = ? or a is null) and (b=? or b is null) " This will select cases where a exactly matches the supplied value and will include the null values in the column - if that is what you want.
26 mar 2012 · You need the ISNULL function. SELECT ISNULL(a, b) b gets selected if a is null. Also, you can use the WHEN/THEN select option, lookup in BOL. Essentially: its c switch/case block meets SQL. edited Jun 23, 2019 at 12:21. answered Mar 26, 2012 at 19:36. Peter Aron Zentai.
The MS Access IsNull() function returns TRUE (-1) if the expression is a null value, otherwise FALSE (0): SELECT ProductName, UnitPrice * (UnitsInStock + IIF(IsNull(UnitsOnOrder), 0, UnitsOnOrder)) FROM Products;
You can use the Nz function to return zero, a zero-length string (" "), or another specified value when a Variant is Null. For example, you can use this function to convert a Null value to another value and prevent it from propagating through an expression. Or you can use: IIF(IsNull(MaritalStatus),"SINGLE",MaritalStatus)
First, the ISNULL function checks whether the parameter value is NULL or not. If True, it will replace the value with Empty string or Blank. Next, IIF will check whether the parameter is Blank or not. If true, Occupation = Occupation otherwise, Occupation = User-provided result.
In SQL, the IS NOT NULL condition is used to select rows if the specified field is NOT NULL. It has the following syntax: SELECT column1, column2, ... FROM table WHERE column_name IS NOT NULL; Here, column1, column2, ... are the table columns. table is the table name from where we select the data.
6 cze 2024 · MS SQL provides a function ISNULL to check for null values: SELECT id, name FROM Department WHERE ISNULL (code, '') = '' OR TRIM (code) = ''; The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null.
