== MySQL: CONCAT(string1, string2). (https://dev.mysql.com/doc/refman/8.0/en/string-functions.html)
== Postgres: string1 || string2. (https://www.postgresql.org/docs/9.1/functions-string.html)
== SQLServer: CONCAT(string1, string2) (https://docs.microsoft.com/pt-br/sql/t-sql/functions/concat-transact-sql?view=sql-server-ver15) ou string1 + string2 (https://docs.microsoft.com/pt-br/sql/t-sql/language-elements/string-concatenation-transact-sql?view=sql-server-ver15)