带有错误 ORA-00904 的 Oracle 更新语句

Posted 2023-03-27

【中文标题】带有错误 ORA-00904 的 Oracle 更新语句

【英文标题】：Oracle update statement with error ORA-00904

【发布时间】：2020-07-07 03:16:46

【问题描述】：

我只有两个简单的表格：

test1(id, name)

和

test2(id, name)

我想根据 test1 更新 test2 中的值。如果 test2 中的值不存在，则应插入新行。

我的查询：

MERGE INTO test2 trg
    USING (
      select c.id
      from test1 c
    ) src ON (src.id = trg.id)
    WHEN MATCHED THEN
      UPDATE
      SET
        trg.name = src.name
    WHEN NOT MATCHED THEN
      INSERT (id)
      VALUES (src.id);

但是这个查询给我带来了错误：

SQL 错误：ORA-00904：“SRC”。“NAME”：标识符无效 00904. 00000 - "%s: 无效标识符"

这是为什么？

表格：

create table test1
(
id number,
name varchar(10)
)

create table test2
(
id number,
name varchar(10)
)

insert into test1(id, name)
select 1, '1' from dual
union all select 2, '2' from dual
union all select 3, '3' from dual
union all select 4, '4' from dual
union all select 5, '5' from dual
union all select 6, '6' from dual
union all select 7, '7' from dual
union all select 8, '8' from dual
union all select 9, '9' from dual
union all select 10, '10' from dual

commit;

insert into test2(id, name)
select 20, '20' from dual
union all select 21, '21' from dual
union all select 22, '22' from dual

commit;

【参考方案1】：

MERGE INTO test2 trg
        USING (
          select c.id,c.name
          from test1 c
        ) src ON (src.id = trg.id)
        WHEN MATCHED THEN
          UPDATE
          SET
            trg.name = src.name
        WHEN NOT MATCHED THEN
          INSERT (id,name)
          VALUES (src.id,src.name)
    

【参考方案2】：

您在 MERGE 语句的 src 子查询中选择的唯一列称为 ID。您还需要在该子查询中选择 NAME 列：

MERGE INTO test2 trg
    USING (
      select c.id, c.name
      from test1 c
    ) src ON (src.id = trg.id)
    WHEN MATCHED THEN
      UPDATE
      SET
        trg.name = src.name
    WHEN NOT MATCHED THEN
      INSERT (id)
      VALUES (src.id);