Question

我试图基于this

为分层组实现闭包表

使用H2，以下似乎不可能：

delete link
  from closure p, closure link, closure c
 where p.parent = link.parent and c.child = link.child
   and p.child=PARENT_ITEM    and c.parent=CHILD_ITEM

这可以重写为在H2上工作，因为它看起来不像H2支持基于H2 grammar的DELETE语句中的表别名

Answer 1

是的，一个完整的例子是：

create table closure(parent int, child int);
insert into closure values(1, 10), (10, 100);

delete from closure where exists(
  select * from closure p, closure c
  where p.parent = closure.parent
  and c.child = closure.child
  and p.child=10
  and c.parent=1);

H2 SQL删除中的表别名

1 个答案: