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24 sty 2013 · A column can only return one data type - DATETIME != string/VARCHAR. If you want a zero length string in the event of the value being NULL, you have to explicitly change the data type, using CAST/CONVERT to change the non-NULL value to a VARCHAR/etc data type.
If they are both null, then I need to basically ignore the BETWEEN and return all records. If @DateFrom is NULL, but @DateTo is NOT NULL, then I need to return all records with DateCreated being no greater than @DateTo (inclusive).
22 sty 2013 · Im trying to filter out the data between the date range, which also includes null values, eg: start_date = 18/01/2013 and end_date = 20/01/2013. In some data in the database the start_date is 19/01/2013 and end_date = null; I need to include this particular value as well, Here's the query I've tried so far
17 lis 2015 · If you're checking whether or not the value is NULL, there is no need to convert it to a date, unless you wanted to return a date value (which you don't seem to). Instead, use: SELECT ISNULL( DOB , '') Which will return '' if the value is NULL. A NULL date is NULL (no value).
20 cze 2024 · Solution. This tip will help you understand what NULL means in the context of the Microsoft Fabric data universe, which includes SQL Server. It will then show how these values can make queries act unexpectedly and how to best interact with NULL values to avoid problems.
24 mar 2024 · The ISNULL function in SQL Server is meant to be an error-handling tool of sorts. It's meant to return a non-NULL value in places where NULL may occur.
3 wrz 2024 · Returns 1 if the expression is a valid datetime value; otherwise, 0. ISDATE returns 0 if the expression is a datetime2 value. For an overview of all Transact-SQL date and time data types and functions, see Date and Time Data Types and Functions (Transact-SQL).
