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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.
24 paź 2014 · I would like to convert a datetime field to varchar so I can show a blank or a message when the date is NULL. This is what I have so far: select isnull(us.Date,0) as USDate, isnull(au.Date,0) as AUDate from ustable us left join autable au on us.column=au.column
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;
4 sty 2011 · null = null = null. One key exception is the IS NULL operator, which returns TRUE if its operand is NULL , FALSE otherwise. This "NULL poisoning" can easily cascade when you write complex expressions using many columns where the values can be NULL .
10 gru 2019 · Null can be a unknown value or an absence of a value, where as an Empty or Blank string is a value, but is just empty. Null can be used for string, Integer, date, or any fields in a database where as Empty is used for string fields.
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.
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).
