本文介绍了一个复杂的SQL查询案例，该查询用于从特定菜单系统中选取符合用户权限的数据记录。通过使用多个子查询、连接以及层次查询等高级SQL特性，实现了对菜单项及其子项的递归检索，并按照特定顺序进行排序。
select m.*
from t_menu m
where m.state = '1'
and ((menu_type = 1 and exists
(select 1
from v_user_menu b
where m.menu_id = b.menu_id
and b.sys_id = '3000')) or
(m.menu_type = 0 and exists
(select 1
from v_user_menu b
where m.menu_id = b.parent_id
and b.sys_id = '3000')))
start with m.parent_id = '0'
connect by prior m.menu_id = m.parent_id
order siblings by menu_order
from t_menu m
where m.state = '1'
and ((menu_type = 1 and exists
(select 1
from v_user_menu b
where m.menu_id = b.menu_id
and b.sys_id = '3000')) or
(m.menu_type = 0 and exists
(select 1
from v_user_menu b
where m.menu_id = b.parent_id
and b.sys_id = '3000')))
start with m.parent_id = '0'
connect by prior m.menu_id = m.parent_id
order siblings by menu_order
扫一扫
611
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
