WebSQL Server. The SQL Server ISNULL () function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL … Web12 dec. 2011 · Below code works great, to check null or empty and fallback to other column: SELECT COALESCE (NULLIF (col1, ''), col2) as 'someName'. Above sql …
How to Check If a SQL Server String Is Null or Empty - ITCodar
Web28 feb. 2024 · The following example returns the name and the weight for all products for which either the weight is less than 10 pounds or the color is unknown, or NULL. SQL. … Web4 aug. 2024 · 5. NULLIF() Function. The NULLIF function takes two expressions and returns NULL if the expressions are equal, or the first expression otherwise.. Syntax: NULLIF(expression_1, expression_2) NULLIF('Red','Orange') -- Returns Red NULLIF(0,NULL) -- Returns 0 NULLIF(0,0) -- Returns NULL. Where NULLIF comes in … parr arizona
Checking if String is NULL or EMPTY in SQL
Web27 sept. 2007 · However, this is actually a great example of when the little-used NULLIF () function can be handy. NULLIF () returns NULL if the two parameters provided are equal; otherwise, the value of the first parameter is returned. Seems a little odd and not very useful, but it is a great way of ensuring that empty strings are always returned as NULLS. Web19 mai 2024 · 1. 2. SELECT FirstName, LastName ,MiddleName FROM Person.Person WHERE. MiddleName IS NULL. The IS NOT NULL condition is used to return the rows that contain non-NULL values in a column. The following query will retrieve the rows from the Person table which are MiddleName column value is not equal to NULL values. 1. Web9 feb. 2009 · SQL Server provides 2 functions for doing this; (i) the ISNULL; and (ii) the COALESCE. Even though the two functions are quite similar, still they have some differences: (1) ISNULL takes only two parameters as … おめざめあかりんご