Oracle数据库开发SQL基础之操作表中数据

一、添加数据

INSERT语句 INSERT INTO table_name(字段的名字，字段的名字)VALUES(VALUE1，VALUE2)

1.向表中所有字段添加值

INSERT INTO userinfo

VALUES (1,‘xxx‘,‘123‘,‘[email protected]‘,sysdate)

2.向表中制定的字段添加值

INSERT INTO userinfo(id,username,userpwd)

VALUES(2,‘yyy‘,‘123‘)

create table userinfo1

(id number(6,0),

regdate date default sysdate

)

insert into userinfo1(id)

values(1)

二、复制表数据

1.创建表时全部复制

CREATE TABLE userinfo_new

as

select*from userinfo

2.创建表时选择复制

CREATE TABLE userinfo_new1

as

select id,username from userinfo

3.再添加时全部复制

INSERT INTO userinfo_new

select*from userinfo

4.选择复制

INSERT INTO userinfo_new(id,username)

select id,username from userinfo

 三、修改数据

1.无条件更新

UPDATE userinfo

SET userpwd=‘111‘

UPDATE userinfo

SET userpwd=‘1‘ ,email=‘[email protected]‘

2.有条件更新

UPDATE userinfo

set userpwd=‘123‘

where username=‘xxx‘

3.无条件删除

create table testd1

as

select*from userinfo

DELETE FROM testd1

4.有条件删除

delete from userinfo

where username=‘yyy‘