我有三个实体用户，公司和地址。每个用户都有一个地址，每个公司都有一个地址。这些实体中的每一个都有一个单独的表。我希望地址不可能同时属于用户和公司。
在用户和公司联接列上使用@OneToOne注释是否可行？
SQL> with test (s_id, sg_id, r_cost, w_cost, av_id, v_id) as
2 (select 123, 100, 0.5, 1, 1, 333 from dual union all
3 select 123, 105, 0.75, 0, 2, 333 from dual union all
4 select 123, 330, 1, null, 3, 888 from dual
5 )
6 select t.s_id,
7 t.v_id,
8 max(nvl(t.w_cost, t.r_cost)) w_cost,
9 (select t1.av_id
10 from test t1
11 where nvl(w_cost, r_cost) = (select max(nvl(t2.w_cost, t2.r_cost))
12 from test t2)
13 and t1.s_id = t.s_id
14 and t1.v_id = t.v_id
15 ) av_id
16 from test t
17 group by t.s_id, t.v_id
18 order by 1, 2;
S_ID V_ID W_COST AV_ID
---------- ---------- ---------- ----------
123 333 1 1
123 888 1 3
SQL>