SQL | COALESCE Function
The Coalesce function of the SQL server is used to manage Null values. During the expression evaluation process, user-defined values are used to replace the null values. This method always returns the first non-null value after evaluating arguments from the supplied arguments list in a specific sequence.
Properties of the Syntax of SQL Server Coalesce function :
- All expressions must be have same data-type.
- It could have multiple expressions.
- The SQL Coalesce function is a syntactic shortcut for the Case expression
SQL Coalesce in a string concatenation operation
SQL Coalesce function and pivoting
returns the concatenated non-null values from the table ‘state’.
Data validation using SQL Coalesce function
Find the emergency employee contacts.
Create a computed column using the Coalesce SQL function so that NULL values are efficiently handled.
