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17 sie 2013 · The problem is due to lack of permissions for SQL Server to access the mdf & ldf files. All these procedures will work : you can directly change the MSSQLSERVER service startup user account, with the user account who have better privileges on the files. Then try to attach the database.
Transact-SQL syntax conventions. Syntax NULLIF ( expression , expression ) Arguments. expression Is any valid scalar expression. Return Types. Returns the same type as the first expression. NULLIF returns the first expression if the two expressions are not equal. If the expressions are equal, NULLIF returns a null value of the type of the first ...
Definition and Usage. The NULLIF () function returns NULL if two expressions are equal, otherwise it returns the first expression. Syntax. NULLIF (expr1, expr2) Parameter Values. Technical Details. More Examples. Example. Compare two expressions: SELECT NULLIF('Hello', 'Hello'); Try it Yourself » Example. Compare two expressions:
The CASE expression is verbose while the NULLIF expression is much shorter and more readable. In this tutorial, you have learned how to use the SQL Server NULLIF expression to return NULL if the first argument equals to the second one.
7 sty 2022 · In SQL Server, the NULLIF() expression checks the value of two specified expressions. It returns a null value if they’re equal, otherwise it returns the first expression. Syntax. The syntax goes like this: NULLIF ( expression , expression ) Example. Here’s an example to demonstrate: SELECT NULLIF(3, 3); Result: NULL
NULLIF is particularly useful when you need to handle equality as a distinct case, such as when you want to hide or suppress certain results in your query. Syntax. The syntax for the SQL NULLIF function is as follows: NULLIF (expression1, expression2) expression1: The first expression or value you want to compare.
This SQL Server tutorial explains how to use the NULLIF function in SQL Server (Transact-SQL) with syntax and examples. In SQL Server (Transact-SQL), the NULLIF function compares expression1 and expression2.
