sql - ORA-38104 : Columns referenced in the ON Clause cannot be updated c. emp_id

Question

我有2个简单的表格

CREATE TABLE employee (
  emp_id INT PRIMARY KEY,
  first_name VARCHAR(40),
  last_name VARCHAR(40),
  birth_day DATE,
  sex VARCHAR(1),
  salary INT,
  super_id INT,
  branch_id INT
);

CREATE TABLE biodata (
  emp_id INT PRIMARY KEY,
  first_name VARCHAR(40),
  last_name VARCHAR(40),
  birth_day DATE,
  sex VARCHAR(1)
);

我想合并它

merge into biodata c
using employee e
on (c.emp_id = e.emp_id)
when matched then
  update set
  c.emp_id=e.emp_id,
  c.first_name=e.first_name,
  c.last_name=e.last_name,
  c.birth_day=e.birth_day,
  c.sex=e.sex
when not matched then
  insert VALUES(e.emp_id,e.first_name,e.last_name,e.birth_day,e.sex);

但是甲骨文说:

ORA-38104: Columns referenced in the ON Clause cannot be updated: c.emp_id

Answer 1

只需从 UPDATE 子句中删除 c.emp_id=e.emp_id，因为它是不相关的

(UPDATE 将在满足条件 c.emp_id = e.emp_id 的表 biodata 的记录上完成。所以将要更新的记录已经具有与 e.emp_id 相同的 emp_id。

merge into biodata c
using employee e
on (c.emp_id = e.emp_id)
when matched then
  update set
  --c.emp_id=e.emp_id,
  c.first_name=e.first_name,
  c.last_name=e.last_name,
  c.birth_day=e.birth_day,
  c.sex=e.sex
when not matched then
  insert VALUES(e.emp_id,e.first_name,e.last_name,e.birth_day,e.sex);

干杯!