Here is my preferred way to check for if null or empty : SELECT * FROM UserProfile WHERE PropertydefinitionID in (40, 53) AND NULLIF(PropertyValue, ”) is null Since it modifies the search argument (SARG) it might have performance issues because it might not use an existing index on the PropertyValue column.
SQL Query to Select All If Parameter is Empty or NULL. In this example, we used the IIF Function along with ISNULL. 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.
12/15/2008 · Sorry. I got a blackout. Of course, ISNULL syntax is to be used in a query where you want to specify an alternative value, if the expression is NULL . The correct way to check for NULL in a condition is IF @Param IS NULL as rich freeman points out.
11/5/2012 · select * from vendor where vendor_email = ”. If you want to combine them to search for the SQL null or empty string together and retrieve all of the empty strings and nulls all at once, you could do something like this. select * from vendor where vendor_email = ” or vendor_email is null.
9/11/2014 · T -SQL (SS2K8) Check the Variable is Empty or Null … If you want to make sure that your varchar value contains some thingelse than NULL and empty string use.
SQL Query to Select All If Parameter is Empty or NULL, How to Filter for SQL Null or Empty String – SQL Training Online, SQL NULL Values – IS NULL and IS NOT NULL – W3Schools, SQL Query to Select All If Parameter is Empty or NULL, The IS NOT NULL operator is used to test for non- empty values (NOT NULL values). The following SQL lists all customers with a value in the Address field: Example. SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NOT NULL ;, If you only want to match as an empty string. WHERE DATALENGTH(COLUMN) > 0 If you want to count any string consisting entirely of spaces as empty . WHERE COLUMN <> ” Both of these will not return NULL values when used in a WHERE clause. As NULL will evaluate as UNKNOWN for these rather than TRUE.
While checking null or Empty value for a column in my project, I noticed that there are some support concern in various Databases. Every Database doesn’t support TRIM method. Below is the matrix just to understand the supported methods by different databases.
3/25/2015 · Inside the stored procedure, the parameter value is first tested for Null using the ISNULL function and then checked whether it is Blank ( Empty ). If the parameter has value then only matching records will be returned, while if the parameter is Null or Blank ( Empty ) then all.
9/27/2007 · will never return an empty string; it will only return either a NULL value or a string with at least one character present. Also remember that SQL ignores trailing spaces when comparing strings, so even if the string isn’t empty but it contains all spaces, it will still return NULL. You can see that behavior here:
