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  • create alter rename desc select update delete insert

    conn scott/root;
    create table student (id number(3), name varchar2(10), sex char(2), sno number(3));
    alter table student add(sal number(7,2), birthday date);
    alter table student modify(name varchar2(10));
    alter table student drop column sal;
    rename student to stu;
    rename stu to student;
    create table classes(class_id number(3), class_name varchar2(10));
    desc student;
    insert into student values(001, 'Tom', '男', 1, '22-4月-82', 100.50);
    insert into student values(003, 'Mary', '女', 3, '24-5月-1988', 3000);
    alter session set nls_date_format = 'yyyy-mm-dd';
    insert into student values(004, '张三', '男', 4, '1997-7-1', 800);

    insert into student values(005, '王五', '女', 5, to_date('1999-9-1','yyyy-mm-dd'), 900);
    insert into student(id, name, sex) values(5, 'Test', '女');
    insert into student(id, name, sex, birthday) values(6, 'Test2', '男', null);
    select * from student where birthday is not null;
    select * from student where birthday is null;
    update student set name = 'Test_1' where name = 'Test';
    update student set name = 'Test_2', birthday = '2000-9-9' where id = 6;
    delete student where birthday = '1997-7-1';
    delete from student where id = 5;

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  • 原文地址:https://www.cnblogs.com/Mike_Chang/p/9281718.html
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