Check null values in if condition in sql server

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design - SQL: empty string vs NULL value - Programmers Stack Exchange

  http://programmers.stackexchange.com/questions/32578/sql-empty-string-vs-null-value
Let's assume that I'm aware of all the technical implications of choosing one solution over another and I can create correct SQL queries for either scenario. Not every one has a middle name, so you need to differentiate between "no middle name" ("" - empty string) and "I don't know if this person has a middle name or not" (NULL)

sql server - How to efficiently check EXISTS on multiple columns? - Database Administrators Stack Exchange

  http://dba.stackexchange.com/questions/19344/how-to-efficiently-check-exists-on-multiple-columns
Single Aggregate Query SELECT MAX(CASE WHEN B IS NULL THEN 1 ELSE 0 END) AS B, MAX(CASE WHEN C IS NULL THEN 1 ELSE 0 END) AS C FROM T This could process both columns at the same time so have a worst case of one full scan. SELECT TOP 2 * FROM (SELECT DISTINCT CASE WHEN b IS NULL THEN NULL ELSE 'foo' END AS b , CASE WHEN c IS NULL THEN NULL ELSE 'bar' END AS c FROM test T WHERE LEFT(b,1) + LEFT(c,1) IS NULL ) AS DT Edit 2 One last tweak that occurred to me is that the query above could still end up processing more rows than necessary in the event that the first row it encounters with a NULL has NULLs in both column B and C

MS SQL Server :: NULL Values In UNPIVOT Output Possible?

  http://www.bigresource.com/MS_SQL-NULL-Values-in-UNPIVOT-output-possible--E7IY5bXV.html
Using ADO.NET, I have been unable to get the Execute SQL task to successfully return the value of an output parameter defined as varchar or nvarchar when the value is null. However, the characters are still there ?I know it sounds a weird one but has anyone experienced something similar and is there a known fix for this problem ?Many thanks regardlesschris

  http://www.c-sharpcorner.com/UploadFile/rohatash/null-value-in-sql-server-2012/
Python Data Types Reader Level: Article NULL Value in SQL Server 2012 By Rohatash Kumar on Dec 11, 2012 Handling SQL NULL value, SQL Coalesce Function, SQL IsNull Function, SQL Null Value, SQL Server 2012, In this article I will explain the NULL value with IsNull() and Coalesce() functions in SQL Server. If you are a developer, you will almost certainly have to deal with NULL values at some point in a project when you work with tables, Stored Procedures etc

SQL Server: IS NULL Condition

  http://www.techonthenet.com/sql_server/is_null.php
Syntax The syntax for the IS NULL condition in SQL Server (Transact-SQL) is: expression IS NULL Parameters or Arguments expression The value to test whether it is a NULL value

SQL Server: IS NOT NULL Condition

  http://www.techonthenet.com/sql_server/is_not_null.php
Syntax The syntax for the IS NOT NULL condition in SQL Server (Transact-SQL) is: expression IS NOT NULL Parameters or Arguments expression The value to test where it is a non-NULL value. For example: DELETE FROM employees WHERE status IS NOT NULL; This SQL Server IS NOT NULL example will delete all records from the employees table where the status does not contain a null value

SQL Server Reporting Services - Check For Null Column Value in an expression. - mredkj.com

  http://www.mredkj.com/vbnet/RSNullCheck.html
After fiddling around with IsDbnull which will not raise an error but which will also not work I found that IsNothing will correctly check for a null value