What is the method for concatenating SQL strings?

In SQL, string concatenation can be achieved using the CONCAT() function. For example, if we want to concatenate two strings together, we can use the following syntax:

SELECT CONCAT('Hello ', 'World') AS concatenated_string;

The above query will return the result: Hello World.

Different database management systems may offer alternative methods for string concatenation, such as using the + operator in Microsoft SQL Server or the || operator in Oracle, in addition to the CONCAT() function. It is important to choose the appropriate method based on the specific database management system being used.