关系型数据库关联更新数据汇总
先给出需求,有2张表,学生表和分数表,两种表都有一个分数列,但是这两列的值不一致,现在需要更新学生表,让学生表中的值等于分数表中的值。
初始化脚本如下:
create table student ( id varchar(100) primary key, name varchar(50), addr varchar(50), score int ); create table score ( stuId varchar(100) primary key, score int ); insert into student(id,name,addr,score) values('1','张三','重庆',100); insert into student(id,name,addr,score) values('2','张三2','重庆',120); insert into student(id,name,addr,score) values('3','张三3','重庆',150); insert into score(stuId,score) values('1',10); insert into score(stuId,score) values('2',12); insert into score(stuId,score) values('4',50);
数据展示如下:
mysql更新脚本:
update student a inner join score b on a.id=b.stuId set a.score=b.score;
oracle更新脚本:
-- 方式一 UPDATE ( select t1.score t1score,t2.score t2score from student t1 inner join score t2 on t1.id=t2.stuId )t set t1score =t2score; -- 方式二 merge into student using (select stuId,score from score) t on (t.stuId = student.id) when matched then update set student.score = t.score;
Sqlserver更新脚本:
update a set a.score=b.score from student a inner join score b on a.id=b.stuId;