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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 returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression. Syntax
3 wrz 2024 · Transact-SQL syntax conventions. Syntax ISNULL ( check_expression , replacement_value ) Arguments check_expression. The expression to be checked for NULL. check_expression can be of any type. replacement_value. The expression to be returned if check_expression is NULL.
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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.
18 mar 2021 · SQL Server ISNULL Syntax. The syntax for the ISNULL() function is very straightforward. The first argument is the expression to be checked. In most cases this check_expression parameter is a simple column value but can be a literal value or any valid SQL expression.
6 cze 2024 · MS SQL provides a function ISNULL to check for null values: SELECT id, name FROM Department WHERE ISNULL(code, '') = '' OR TRIM(code) = ''; 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 .
