================================================================================
basic
================================================================================
create trigger tr before insert on mytable execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
constraint
================================================================================
create constraint trigger tr before insert on mytable execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
after
================================================================================
create trigger tr after insert on mytable execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
instead of
================================================================================
create trigger tr instead of insert on mytable execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
many when
================================================================================
create trigger tr before insert or update or delete or truncate on mytable execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
scope for statement
================================================================================
create trigger tr before insert on mytable for statement execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_scope)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
scope for each row
================================================================================
create trigger tr before insert on mytable for each row execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_scope)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
scope for each statement
================================================================================
create trigger tr before insert on mytable for each statement execute foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_scope)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
execute procedure
================================================================================
create trigger tr before insert on mytable execute procedure foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
execute function
================================================================================
create trigger tr before insert on mytable execute function foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_exec
      (function_call
        (identifier)))))

================================================================================
when
================================================================================
create constraint trigger a.tr before insert or delete on foo.mytable for each statement when (new.baz != old.baz) execute function foo();
--------------------------------------------------------------------------------

(source_file
  (create_trigger_statement
    (identifier)
    (trigger_when)
    (trigger_event)
    (identifier)
    (trigger_scope)
    (trigger_cond
      (op_expression
        (identifier)
        (comparison_op)
        (identifier)))
    (trigger_exec
      (function_call
        (identifier)))))