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28 gru 2010 · To get all rows wtih an empty datetime column you could do this: SELECT * FROM yourtable WHERE yourdatecolumn IS NULL
The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder, 0)) FROM Products;
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).
It is important to understand that a NULL column value is different than having a blank (empty string) or 0 value in a column. eg. ' ' or (empty string) <> NULL, 0 <> NULL. Let’s take a look at a few examples to illustrate these points.
11 lip 2012 · Is there any better way to write the lines below in SQL Server 2005? CASE WHEN (ID IS NULL) THEN 'YES' WHEN (ID IS NOT NULL) THEN 'NO' END AS ID_Value, sql-server
23 lut 2017 · I have 3 columns with different dates. I need a function that: IF Column Date1 is empty, take Column Date2, and if this one is empty, take Column Date3. If i use Column (Date1)="", it says DAX comparison cant compare Date with Text, the same happen when I use 0 or null.
4 sty 2024 · In SQL Server, NULL represents the absence of a value in a column. It signifies missing or undefined data, distinct from zero or an empty string. SQL Server uses a three-valued logic, and handling NULL is crucial for accurate querying and reporting.
