当前位置： 首页 > news >正文

【数据库差异研究】update与delete使用表别名的研究

news 2025/7/19 14:50:06

目录

⚛️总结

☪️1 Update

♋1.1 测试用例UPDATE users as a SET a.age = 111 WHERE a.name = 'Alice';

♏1.2 测试用例UPDATE users as a SET a.age = 111 WHERE name = 'Alice';

♐1.3 测试用例UPDATE users as a SET age = 111 WHERE a.name = 'Alice';

♑1.4 测试用例UPDATE users as a SET age = 111 WHERE name = 'Alice';

☪️2 delete

♉2.1 测试用例delete users as a from a WHERE a.name = 'Alice';

♈2.2 测试用例delete users as a from a WHERE name = 'Alice';

⚛️总结

Update

SQL语句示例OracleSQLitePostgreSQLMYSQL & mariadb
UPDATE users as a SET a.age = 111 WHERE a.name = 'Alice';报错报错报错正常执行
UPDATE users as a SET a.age = 111 WHERE name = 'Alice';报错报错报错正常执行
UPDATE users as a SET age = 111 WHERE a.name = 'Alice';报错正常执行正常执行正常执行
UPDATE users as a SET age = 111 WHERE name = 'Alice';报错正常执行正常执行正常执行

Delete

SQL语句示例OracleSQLitePostgreSQLMYSQL & mariadb
delete from users as a WHERE a.name = 'Alice';报错报错报错报错
delete from users as a WHERE name = 'Alice';报错报错报错报错

☪️1 Update

♋1.1 测试用例UPDATE users as a SET a.age = 111 WHERE a.name = 'Alice';

UPDATE users as a SET a.age = 111 WHERE a.name = 'Alice';

CREATE TABLE users (name VARCHAR(255) NOT NULL,age INT
);INSERT INTO users (name, age) VALUES ('Alice', 25);
INSERT INTO users (name, age) VALUES ('Bob', 30);
INSERT INTO users (name, age) VALUES ('Charlie', 35);
INSERT INTO users (name, age) VALUES ('Alice', 40);SELECT * FROM users;
UPDATE users as a SET a.age = 111 WHERE a.name = 'Alice';
SELECT * FROM users;

修改前表内容如下：

nameage
Alice25
Bob30
Charlie35
Alice40

1 ORACLE

执行报错

ORA-00971: missing SET keyword

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

2 sqlite

执行报错

Error: near line 12: near ".": syntax error

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

3 PG

执行报错

psql:commands.sql:12: ERROR:  column "a" of relation "users" does not exist
LINE 1: UPDATE users as a SET a.age = 111 WHERE a.name = 'Alice';

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

4 MYSQL & mariadb

执行正常

后表内容已经更新，如下：

nameage
Alice111
Bob30
Charlie35
Alice111

♏1.2 测试用例UPDATE users as a SET a.age = 111 WHERE name = 'Alice';

UPDATE users as a SET a.age = 111 WHERE name = 'Alice';

CREATE TABLE users (name VARCHAR(255) NOT NULL,age INT
);INSERT INTO users (name, age) VALUES ('Alice', 25);
INSERT INTO users (name, age) VALUES ('Bob', 30);
INSERT INTO users (name, age) VALUES ('Charlie', 35);
INSERT INTO users (name, age) VALUES ('Alice', 40);SELECT * FROM users;
UPDATE users as a SET a.age = 111 WHERE name = 'Alice';
SELECT * FROM users;

修改前表内容如下：

nameage
Alice25
Bob30
Charlie35
Alice40

1 ORACLE

执行报错

ORA-00971: missing SET keyword

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

2 sqlite

 执行报错

Error: near line 12: near ".": syntax error

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

3 PG

  执行报错

psql:commands.sql:12: ERROR:  column "a" of relation "users" does not exist
LINE 1: UPDATE users as a SET a.age = 111 WHERE name = 'Alice';

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

4 MYSQL & mariadb

执行正常

后表内容已经更新，如下：

nameage
Alice111
Bob30
Charlie35
Alice111

♐1.3 测试用例UPDATE users as a SET age = 111 WHERE a.name = 'Alice';

UPDATE users as a SET age = 111 WHERE a.name = 'Alice';

CREATE TABLE users (name VARCHAR(255) NOT NULL,age INT
);INSERT INTO users (name, age) VALUES ('Alice', 25);
INSERT INTO users (name, age) VALUES ('Bob', 30);
INSERT INTO users (name, age) VALUES ('Charlie', 35);
INSERT INTO users (name, age) VALUES ('Alice', 40);SELECT * FROM users;
UPDATE users as a SET age = 111 WHERE a.name = 'Alice';
SELECT * FROM users;

修改前表内容如下：

nameage
Alice25
Bob30
Charlie35
Alice40

1 ORACLE

 执行报错

ORA-00971: missing SET keyword

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

2 sqlite

执行正常

后表内容已经更新，如下：

nameage
Alice111
Bob30
Charlie35
Alice111

3 PG

执行正常

后表内容已经更新，如下：

nameage
Bob30
Charlie35
Alice111
Alice111

4 MYSQL & mariadb

执行正常

后表内容已经更新，如下：

nameage
Alice111
Bob30
Charlie35
Alice111

♑1.4 测试用例UPDATE users as a SET age = 111 WHERE name = 'Alice';

UPDATE users as a SET age = 111 WHERE name = 'Alice';

CREATE TABLE users (name VARCHAR(255) NOT NULL,age INT
);INSERT INTO users (name, age) VALUES ('Alice', 25);
INSERT INTO users (name, age) VALUES ('Bob', 30);
INSERT INTO users (name, age) VALUES ('Charlie', 35);
INSERT INTO users (name, age) VALUES ('Alice', 40);SELECT * FROM users;
UPDATE users as a SET age = 111 WHERE name = 'Alice';
SELECT * FROM users;

修改前表内容如下：

nameage
Alice25
Bob30
Charlie35
Alice40

1 ORACLE

 执行报错

ORA-00971: missing SET keyword

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

2 sqlite

执行正常

后表内容已经更新，如下：

nameage
Alice111
Bob30
Charlie35
Alice111

3 PG

执行正常

后表内容已经更新，如下：

nameage
Bob30
Charlie35
Alice111
Alice111

4 MYSQL & mariadb

执行正常

后表内容已经更新，如下：

nameage
Alice111
Bob30
Charlie35
Alice111

☪️2 delete

♉2.1 测试用例delete users as a from a WHERE a.name = 'Alice';

delete users as a from a WHERE a.name = 'Alice';

CREATE TABLE users (name VARCHAR(255) NOT NULL,age INT
);INSERT INTO users (name, age) VALUES ('Alice', 25);
INSERT INTO users (name, age) VALUES ('Bob', 30);
INSERT INTO users (name, age) VALUES ('Charlie', 35);
INSERT INTO users (name, age) VALUES ('Alice', 40);SELECT * FROM users;
delete users as a from a WHERE a.name = 'Alice';
SELECT * FROM users;

修改前表内容如下：

nameage
Alice25
Bob30
Charlie35
Alice40

1 ORACLE

 执行报错

ORA-03048: SQL reserved word 'AS' is not syntactically valid following 'delete
users '

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

2 sqlite

 执行报错

Error: near line 12: near "users": syntax error

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

3 PG

 执行报错

psql:commands.sql:12: ERROR:  syntax error at or near "users"
LINE 1: delete users as a from a WHERE a.name = 'Alice';

 之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

4 MYSQL & mariadb

 执行报错

ERROR 1064 (42000) at line 12: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as a from a WHERE a.name = 'Alice'' at line 1

 之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

♈2.2 测试用例delete users as a from a WHERE name = 'Alice';

delete users as a from a WHERE name = 'Alice';

CREATE TABLE users (name VARCHAR(255) NOT NULL,age INT
);INSERT INTO users (name, age) VALUES ('Alice', 25);
INSERT INTO users (name, age) VALUES ('Bob', 30);
INSERT INTO users (name, age) VALUES ('Charlie', 35);
INSERT INTO users (name, age) VALUES ('Alice', 40);SELECT * FROM users;
delete users as a from a WHERE name = 'Alice';
SELECT * FROM users;

修改前表内容如下：

nameage
Alice25
Bob30
Charlie35
Alice40

1 ORACLE

 执行报错

ORA-03048: SQL reserved word 'AS' is not syntactically valid following 'delete
users '

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

2 sqlite

 执行报错

Error: near line 12: near "users": syntax error

之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

3 PG

 执行报错

psql:commands.sql:12: ERROR:  syntax error at or near "users"
LINE 1: delete users as a from a WHERE name = 'Alice';

 之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

4 MYSQL & mariadb

 执行报错

ERROR 1064 (42000) at line 12: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as a from a WHERE name = 'Alice'' at line 1

 之后查询表内容未发生变化，如下：

nameage
Alice25
Bob30
Charlie35
Alice40

http://www.lryc.cn/news/451969.html

相关文章：

  • idea远程连接docker
  • Docker 安装 ClickHouse 教程
  • 过渡到内存安全语言：挑战和注意事项
  • 在Pycharm中安装Cv2
  • 减少重复的请求之promise缓存池（构造器版） —— 缓存promise，多次promise等待并返回第一个promise的结果
  • cdq+bitset处理高维偏序
  • 敏捷开发和传统开发，你更适合哪种？
  • python之with
  • vue3 升级实战笔记
  • 利用函数模块化代码实操 ← Python
  • Java高效编程（12）：重写toString方法
  • 谷歌给到的185个使用生成式AI的案例
  • 程序员如何通过专业与软技能提升核心竞争力
  • 基于YOLOv8的智能植物监测机器人
  • 2024年OpenAI DevDay发布实时 API、提示缓存等新功能
  • Raspberry Pi3B+之安装bookworm+Rpanion系统
  • 无人机专业除理论外，飞手执照、组装、调试实操技术详解
  • 【网路通信基础与实践番外二】TCP协议的流量控制和拥塞控制以及二者区别和例题
  • SpringBoot3+Vue3开发后台管理系统脚手架
  • OpenFeign微服务部署
  • 【C语言】数组（下）
  • cGANs with Projection Discriminator
  • mysql学习教程，从入门到精通，SQL HAVING 子句（32）
  • JavaScript while循环语句
  • 49天精通Java(Day 2)：Java的基本语法
  • uni-app之旅-day01-home页
  • Vue3轻松实现导出Excel文件功能
  • 在Kali Linux中使用VNC和iptables配置xrdp以实现远程连接
  • 小徐影院：Spring Boot技术下的影院革新
  • 命名空间