MySQL 9.2 Release Notes
        
    This section describes the syntax for the
    BEGIN ... END
    compound statement and other statements that can be used in the body
    of stored programs: Stored procedures and functions, triggers, and
    events. These objects are defined in terms of SQL code that is
    stored on the server for later invocation (see
    Chapter 27, Stored Objects).
  
A compound statement is a block that can contain other blocks; declarations for variables, condition handlers, and cursors; and flow control constructs such as loops and conditional tests.