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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.
The operating system returned the error '5(access denied.)' when restoring database in sql server can be solved by enabling the Relocate all files to folder in the Files options as follows:
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:
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 ...
To solve this problem, as you may guess, we use the NULLIF function. SELECT article_id, title, COALESCE(NULLIF(excerpt,''), LEFT(body, 50)) AS summary FROM articles;Code language:SQL (Structured Query Language)(sql) If the excerpt is empty, the NULLIF function returns NULL, otherwise it returns the excerpt.
Syntax. The syntax for the SQL NULLIF function is as follows: NULLIF(expression1, expression2) expression1: The first expression or value you want to compare. expression2: The second expression or value you want to compare to expression1.
SQL Server NULLIF expression overview. The NULLIF expression accepts two arguments and returns NULL if two arguments are equal. Otherwise, it returns the first expression. The following shows the syntax of the NULLIF expression: NULLIF(expression1, expression2) Code language: SQL (Structured Query Language) (sql)
