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oracle学习14-命令学习2

凛冬已至夏日未远 2022-08-27 阅读 107

6继续玩,改变查询结果列名

select name as xm,birthday as workday from student;--修改列名name为xm,birthday为workday

select * from student;

oracle学习14-命令学习2_字段

 

7 select xh||sex from student--将选择的字段竖行排列

oracle学习14-命令学习2_字段_02

 

8 select name,sal,

case when sal<=10000 then 'underpaid'

     when sal>=30000 then 'overpaid'

       else 'ok'

      end as status

      from student--当大于30000,输出薪酬过高,小于10000输出过低,其他正常

oracle学习14-命令学习2_字段_03

 

10 select*from student where rownum<=5;--限制出现行数为五行¡

oracle学习14-命令学习2_字段_04

 



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