--2基于单表按选择操作定义视图 create view cp_sel as select * from 产品 where 产品名称='主板'
http://www.codebf.com/read/255732/12061605
--2-1 查询视图 select * from aaa
http://www.codebf.com/read/255732/12061619
--2-2 插入视图 insert into cp_sel values ('PR200515','键盘','康柏',$30)
http://www.codebf.com/read/255732/12061621
--2-3 视图更新、删除操作 update cp_sel set 单价=$3000 where 产品号='PR200504' delete from cp_sel where 产品号='PR200511' select * from cp_sel
http://www.codebf.com/read/255732/12061624
2.297909e+01 +j 1.474481e+01
http://www.codebf.com/read/152978/12069181
-2.355989e-03 -1.624535e-02 -1.659329e-03 -8.997178e-01 3.795738e-02 -4.348184e-01
http://www.codebf.com/read/255520/12077412
http://www.codebf.com/read/255334/12087982
http://www.codebf.com/read/255243/12094018
http://www.codebf.com/read/152033/12149618
http://www.codebf.com/read/254076/12163514
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