摘要:
--创建学生表 create table students ( id int unsigned not null auto_increment primary key, name varchar(20) default '', age tinyint unsigned default 0, high 阅读全文
posted @ 2018-11-26 19:43
aclover
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摘要:
视图 视图本质就是对查询的封装 创建视图(定义视图 起名以v_开头) create view v_students as select classes.name as c_name ,students.* from students inner join classes on students.cl 阅读全文
posted @ 2018-11-26 16:28
aclover
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