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The ISNULL () function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.
3 wrz 2024 · Return types. Returns the same type as check_expression. If a literal NULL is provided as check_expression, ISNULL returns the data type of the replacement_value. If a literal NULL is provided as check_expression and no replacement_value is provided, ISNULL returns an int.
You can use ISNULL and check the answer against the known output: SELECT case when ISNULL(col1, '') = '' then '' else col1 END AS COL1 FROM TEST
The ISNULL() function can be used anywhere that the SQL syntax allows for the use of a function but the main use case for this function is in the SELECT list of a SQL query when you want to convert any NULL values being returned to something more descriptive.
10 maj 2019 · The SQL Server ISNULL function returns the replacement value if the first parameter expression evaluates to NULL. SQL Server converts the data type of replacement to data type of expression. Let’s explore SQL ISNULL with examples. Example 1: SQL Server ISNULL function in an argument. In this example, SQL ISNULL function returns the second ...
The ISNULL () function accepts two arguments: expression is an expression of any type that is checked for NULL. replacement is the value to be returned if the expression is NULL. The replacement must be convertible to a value of the type of the expression.
The ISNULL function takes two parameters—the expression to be checked for NULL and the value to be returned if the expression is NULL. Syntax. Here is the basic syntax of the ISNULL function: ISNULL(expression, replacement_value) expression: This is the value that you want to check for NULL.
