技術標籤：阿里Java學習路線

修改資料

課程中基礎表修改

alter table stu rename to tb_student;
alter table tb_student change number id char(11);
alter table tb_student change name sname varchar(50);
alter table tb_student change gender sex varchar(10);

INSERT INTO tb_student(id,sname,age,sex) VALUES('stu_1001', 'zhangSan', 28, 'male');
INSERT INTO tb_student(id,sname) VALUES('stu_1002', 'liSi');
INSERT INTO tb_student(id,sname) VALUES('stu_1003', 'wangWu');
INSERT INTO tb_student(id,sname,age,sex) VALUES('stu_1004', 'zhaoLiu', 32, 'fa
male');
 

UPDATE 表名 SET 列名1=值1, … 列名n=值n [WHERE 條件]
條件（條件可選的）：
（1）條件必須是一個boolean型別的值或表示式：UPDATE t_person SET gender=‘男’, age=age+1 WHERE sid=‘1’;
（2）運算子：=、!=、<>、>、<、>=、<=、BETWEEN…AND、IN(…)、IS NULL、NOT、OR、AND

//操作示例
update tb_student set age =18;
update tb_student set age =28,sex='male';
update
 
 tb_student set sex='female' where sname='zhangSan';
update tb_student set age=18 where sname='wangWu' or id='stu_1004';
update tb_student set age=38 where sname='zhangSan';
update tb_student set age=48 where sname='zhaoLiu';

update tb_student set age=48 where age between 20 and 40;
update tb_student set
 
 age=36 where sname in('zhangSan','liSi');
update tb_student set age=null where age between 20 and 40;
update tb_student set age=10 where age is null; // 設定null值只能用 is 不能用 = 
update tb_student set age=100 where age is not null;

update tb_student set age=10 where 1=1; // 1=1無意義，age會全部修改，特殊情況下可以使用