Question

这可能是一个简单的查询，但我似乎无法写出来。

如何在表格中查找表格中没有以下值的所有记录的查询

因此对于以下帐户，我需要插入此表值

Account = Test003
Role    = Owner
Grp     = AO1

因为此表没有任何具有Role或Grp =的列到上面的

--------------------------------------------------
| ACCOUNT          |   ROLE  |    GRP   |
--------------------------------------------------

| Test003          | Overlay |    WAD    |

Answer 1

要进行MERGE工作，请使用DUAL表为要搜索的值生成一行。

merge into your_table yt
using ( select 'Test003' as acct
                , 'Owner' as role
                , 'AO1' as grp
        from dual ) q
  on (yt.account = q.acct
  and yt.role = q.role
  and yt.grp = q.grp)
when not matched then
  insert (account, role, grp)
  values (q.acct, q.role, q.grp)

如果要合并多个记录，可以在USING中使用UNION ALL在DUAL上创建一组多个查询。

Answer 2

这就是我理解这个问题的方法：

SQL> create table test
  2    (account    varchar2(10),
  3     role       varchar2(10),
  4     grp        varchar2(10));

Table created.

SQL> -- insert sample data
SQL> insert into test
  2    (select 'test001', 'actor'   , 'a01' from dual union  --> contains GRP
  3     select 'test002', 'director', 'd02' from dual union
  4     select 'test003', 'owner'   , 'a01' from dual union  --> contains ROLE and GRP
  5     select 'test004', 'overlay' , 'wad' from dual
  6    );

4 rows created.

SQL>

以上示例数据意味着我应该插入＆＃34;所有者＆＃34;和＆＃34; a01＆＃34;对于帐户test002和test004，因为他们没有角色=所有者和grp = a01

SQL> insert into test (account, role, grp)
  2    (select x.account, 'owner', 'a01'
  3     from (select account
  4           from test
  5           where role <> 'owner'
  6             and grp <> 'a01'
  7          ) x
  8    );

2 rows created.

SQL> select * from test
  2  order by account, role, grp;

ACCOUNT    ROLE       GRP
---------- ---------- ----------
test001    actor      a01
test002    director   d02
test002    owner      a01
test003    owner      a01
test004    overlay    wad
test004    owner      a01

6 rows selected.

SQL>

Oracle查询以查找不存在的表中的记录？

2 个答案: