PostgreSQL update from 根据 A 表更新 B 表

PostgreSQL About 775 words

准备工作

-- 创建表1
create table t1(id integer, name text);

-- 创建表2
create table t2(id integer, name text);

-- 表1中填充数据
insert into t1(id, name) values(1, 't111111');
insert into t1(id, name) values(2, 't222222');
insert into t1(id, name) values(3, 't333333');

-- 表2中填充数据
insert into t2(id) values(2);
insert into t2(id) values(5);
insert into t2(id,name) values(6,'t66666');

查看当前表1数据

z-blog=# select * from t1;
 id |  name
----+---------
  1 | t111111
  2 | t222222
  3 | t333333
(3 rows)

查看当前表2数据

z-blog=# select * from t2;
 id |  name
----+--------
  2 |
  5 |
  6 | t66666
(3 rows)

执行更新

update from语句可以根据表1更新表2。

update t2 set name = t1.name from t1 where t2.id = t1.id;

查看更新后表2数据

z-blog=# select * from t2;
 id |  name
----+---------
  2 | t222222
  5 |
  6 | t66666
(3 rows)
Views: 4,760 · Posted: 2021-01-04

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