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oracle学习15-命令学习3

斗米 2022-08-20 阅读 139

11插入数据

INSERT INTO student VALUES ('A007', null,'女', '小华', '24-7月-15', 27,17891345129,32000,'工程部');

oracle学习15-命令学习3_升序

select * from student where xh is null;--查找某一项值为空

12 select coalesce(XH,0) from student--将空值转换为实际值

13按指定方式排序

oracle学习15-命令学习3_字段_02

select name,depo,sal from student order by sal desc;--按工资大小进行升序排列

14 select xh,depo,sal from student order by xh,sal desc;--按照优先次序从左向右排列

oracle学习15-命令学习3_字段_03

15继续插入数据

INSERT INTO student VALUES ('A008', 0805,'女', '小华', '21-7月-15', 37,17891345129,32000,'研发部');

INSERT INTO student VALUES ('A009', 0806,'女', '小华', '21-7月-15', 47,17891345129,11200,'研发部');

select name,birthday,telephone

 from student order by substr(telephone,length(telephone)-2)

 --查找姓名,生日,电话号码按照电话号码的最后两个字段排序

oracle学习15-命令学习3_升序_04



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