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When to return 1900-01-01 when field is null?
The following piece of code is returning 1900-01-01 when the DOB field is null. I wanted (and expected) it to return an empty string (”) but it’s not.
What does The isnull return in SQL Server?
If a literal NULL is provided as check_expression and no replacement_value is provided, returns an int. This will happen with DATETIME as well as DATETIME2: Which returns an empty string as desired. The ISNULL here returns 0. If you’re not up on how SQL Server stores and deals with dates, see my Q&A here for more information.
What happens to null date in SQL Server?
A NULL date is NULL (no value). An empty string, on the other hand, evaluates to 0, which in SQL Server is implicitly an integer representing the number of days since 1900-01-01. This will convert the NULL date to space. The application layer (Excel) handles space fine
Why does ISNULL return a blank value for docdate?
I have a datetime2 column called DocDate that I am trying to evaluate an ISNULL check against to return a blank ” value for instead of NULL. My WHERE clause clearly brings back only the rows that are explicitly NULL, so it is not an issue of DocDate being an empty string and evaluating to 0.
When to return an int or null value?
If a literal NULL is provided as check_expression and no replacement_value is provided, returns an int. 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). if the value is NULL. A NULL date is NULL (no value).
When to add a default value to a field?
Understand default values You add a default value to a table field or form control whenever you want Access to enter a value in a new record automatically. For example, you can have Access always add the current date to new orders. Typically, you add a default value to your table fields.