数据库表的创建、修改、清空、数据的插入、更新、删除 语句

--创建表格

create table test
(name varchar2(8),
 age number(4),
 job varchar(8) )
-----------------------------------------------------------------------------------------------------------------------------
--修改表格

alter table test  --增加一列
add(hiredate date)

alter table test --修改数据类型
modify(hiredate varchar(10))

select *from test

alter table test  -- 删除一列
drop(age)
-------------------------------------------------------------------------------------------------------------------------------
 --插入数据
insert into test (name,job,hiredate)values ('0000','哈哈','05-01-1998');
insert into test (name,job,hiredate)values ('0001','哈哈1','05-01-1998');
insert into test (name,job,hiredate)values ('0002','哈哈2','05-01-1998');
insert into test (name,job,hiredate)values ('0003','哈哈3','05-01-1998');
insert into test (name,job,hiredate)values ('0004','哈哈4','05-01-1998');

delete test where name='0000'--删除数据
-------------------------------------------------------------------------------------------------------------------------------
--更新数据
update test
set name='姓名'
where name like '%00%'

select *from test

truncate table test          -- 清空表内数据
--
drop table test --删除表
执行完之后，表将不复存在，只能再次创建新表