在mysql中打印语句

Question

我想比较两列不同的表。我有两个表Books_status，它们有book_id和count，它们总共没有书籍，另一个表是Books_course，它有两列book_id和mini，它们给出了最小的no。的书我想比较Books_status和books_course中的mini的数量。

create trigger alarm after update on Books_status for each row 
    -> begin
    -> declare cnt123 integer;
    -> declare mini integer;
    -> select count into cnt123 from Books_status where book_id=new.book_id;
    -> select minimum into mini from Books_course where book_id=new.book_id;
    -> if( mini > cnt123 ) then select 'order books' as '';
    -> else select 'no issue' as '';
    -> end |

它给我的错误

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 9