Sql server isnull or empty SQL Query to Select All If Parameter is Empty or NULL Examples. On the other hand, an empty string is an actual value that can be compared to in a database. please try this sample pattern script: SELECT * FROM [Employee] WHERE EMail is not null -- not null check and Email != '' -- not empty check Jun 6, 2024 · The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null. This query retrieves rows where the code column is either null, an empty string, or contains only spaces. COUNTRY, '', 'United States') -- Doesn't replace empty string ISNULL(Address. To determine whether an expression is NULL, use IS NULL or IS NOT NULL instead of comparison operators (such as = or !=). 在本教程中，您将学习如何使用SQLServerISNULL()函数,SQLServer函数实例如果表达式为NULL，则返回指定值，否则返回表达式：SELECTISNULL(NULL,'W3Schools. How do I get coalesce to work such that if Other is an empty str Aug 22, 2017 · In SQL Server: Since you want to use an empty string instead of null, then you are going to be converting to a string. If @Param = '00000000-0000-0000-0000-000000000000' lhd. AND binds before OR! You need a pair of parentheses, which is not a matter of "clarity", but pure logic necessity. iqmnckrkphnquuvaevarkhtcpppyhyulftajwpyzapkeathwcmtewbjlrftoaxetlafdalhaiocpafed