drop database if exists school; // 如果存在SCHOOL则删除create database school; // 建立库SCHOOLuse school; // 打开库SCHOOLcreate table teacher( // 建立表TEACHER id int(3) auto_increment not null primary key, name char(10) not null, address varchar(50) de
drop database if exists school; // 如果存在school则删除create database school; // 建立库schooluse school; // 打开库SCHOOLcreate table teacher( // 建立表TEACHER id int(3) auto_increment not null primary key, name char(10) not null, address varchar(50) de
Hbase创建表时遇到以下错误: ERROR: org.apache.hadoop.hbase.ZooKeeperConnectionException: HBase is able to connect to ZooKeeper but the connection closes immediately. This could be a sign that the server has too many connections (30 is the default). Consider ins
创建表mm: 其中id为主键且自增长 ) primary key not null unique auto_increment, name ) not null, age ), class ) not null ); 为表mm,插入数据 insert into mm(id,name,age,class) values (,,'XY'), (,,'uuy'), (,,'lf'); 修改表名mm为students: alter table mm rename students; 删除mm表里所有的
--选中数据库,点击新建查询,然后执行即可--这是SQL中的注释信息,使用两个减号来注释. drop table Book --删除表Book create table Book --创建表Book (Id int primary key identity(1,1), Booktitle nvarchar(100) not null, ISBN nvarchar(100) not null, Typeid nvarchar(100), Author nvarchar(100) not null,
