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Concatenating in SQL is pretty simple, it's purpose is to connect fields and string together as one string, like so.

If you have a database table field called forename and you would like to have the word MR before each name, this is how it would be done.

SELECT CONCAT('Mr. ', forename) FROM table;

You can also pass as many arguments as you like through this function, for example.

SELECT CONCAT('Mr. ', forename, ' ', surname, ' - ', jobTitle) FROM table;