Oracle 基本数据管理语言（DML） sql实例

select * from

managerinfo;

--添加语句

INSERT INTO

managerinfo (managerid,loginname,password,name,tel)

values('1','xiaoming','1234','xiaoming','13853635223');

select table_name

from user_tables;

select * from

managerinfo;

--插入新入数据

insert into

managerinfo (managerid,loginname,password,name,tel) values

('2','zhangsan','1234','zhangsan','18554525695');

--创建账号信息表

create table

logininfo (

LoginNamevarchar2(10) NOT NULL,

LogionPaswordvarchar2(10) NOT Null,

CONSTRAINTS

PK_Loginname PRIMARY KEY(LoginName)

);

--从一个表的特定列导入到另一个表内

INSERT INTO

logininfo (loginname,logionpasword) SELECT loginname,password FROM managerinfo;

--查询语句查找logininfo的全部字段

select * from

logininfo;

DROP table

logininfo;

--创建表时插入数据

CREATE TABLE

logininfo AS SELECT loginname,password FROM managerinfo;

--修改表中数据UPDATE

UPDATE logininfo SET

password = '3456' WHERE loginname = 'xiaoming';

--修改表中全部数据

UPDATE logininfo SET

loginname = 'test';

--删除数据

DELETE FROM

logininfo where loginname = 'zhangsan';

--删除表中全部数据

DELETE FROM

logininfo;

--TRUNCATE关键字与DELETE相似，区别在于TRUNCATE是无条件删除

TRUNCATE TABLE

logininfo;

--MERGE关键字与update功能相似，区别在于MERGE可以对数据表同时进行添加和修改

/*

MERGE [INTO]

table_name1

USING table_name2

ON (condition)

WHEN MATCHED THEN merge_update_clause

WHEN NOT MATCHED THENmerge_insert_clause;

*/

--其中merge_update_clause为条件正确是执行的sql语句；merge_insert_clause:为条件不正确是执行的sql

--MERGE更新数据表

MERGE INTO logininfo

using managerinfo

ON(logininfo.loginid =managerinfo.managerid)

WHEN MATCHED THEN UPDATE SETlogininfo.loginname = managerinfo.loginname;

--MERGE插入数据

MERGE INTO logininfo

using managerinfo

ON(logininfo.loginid =managerinfo.managerid)

WHEN NOT MATCHED THEN INSERT VALUES(managerinfo.name,managerinfo.password,managerinfo.managerid);

--MERGE插入与更新数据

MERGE INTO logininfo

USING managerinfo

ON

(logininfo.loginid = managerinfo.managerid)

WHEN MATCHED THEN UPDATE SETlogininfo.loginname = managerinfo.loginname

WHEN NOT MATCHED THEN INSERTvalues(managerinfo.loginname,managerinfo.password,managerinfo.managerid);