mysql数据库命令行基本操作 1.用命令行创建一个数据库 CREATE DATABASE mydb; //创建一个mydb的数据库 CREATE DATABASE IF NOT EXISTS mydb; //若数据库存在则忽略这语句,不存在则创建数据库 说明:①数据库不区分大小写 ②命令行每条语句结束用英文;来结束③IF NOT EXISTS 表示数据库不存在会创建,存在则...
lamp.err mysql-bin.000002 mysql-bin.000007 mysql-bin.000012 test [root@lamp ~]# file /mydata/data/students/db.opt #查看students数据库中db.opt文件类型 /mydata/data/students/db.opt: ASCII text 2、修改数据库: ALTER {DATABASE | SCHEMA} [db_name] alter_specification ...#修改数据库的属性...
在弹出的【Apply SQL Script to Database】窗口中,可以看到创建表的SQL脚本,单击【应用(apply)】按钮,如下图所示。 6 该窗口提示你可以执行SQL语句,单击【完成(Finsh)】按钮,如下图所示。 步骤阅读 7 创建完成后,可以看到Tables下名为"createtable"的表,如下图所示。 END...
-> CONSTRAINT C4 CHECK(Ssex IN("男","女")), -> CONSTAINT Student1KEY PRIMARY KEY(Sno) -> ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CONST RAINT C1 CHECK(Sno ...
CREATE DATABASE|SCHEMA [IF NOT EXISTS] db_name [CHARACTER SET=] [COLLATE] 创建数据库可以设置字符集,排序规则 mysql>SHOW CHARACTER SET; #查看字符集 +---+---+---+---+ | Charset | Description | Default collation | Maxlen | +---+---+---+---+ ...
Database changed mysql>createtablestudent(sidint,snamevarchar(10)); Query OK,0rowsaffected (0.11sec) mysql>createtabletest1.student(sidint,snamevarchar(10)); ##在test1数据库下创建student表 Query OK,0rowsaffected (0.15sec) mysql>createtableifnotexistsstudent(sidint,snamevarchar(10)); ...
URL: http://dev.mysql.com/doc/refman/8.0/en/create-database.html mysql> 2>.当创建当数据本身存在没有写明“IF NOT EXISTS”子句是,创建数据库当语句会报错 3>.create_specification子句指明创建数据库的属性,并且存储在db.opt文件中 •Characterset属性指明此数据库的默认字符集 ...
In the above query, we use IF NOT EXISTS to ensure that there is no table with the name student_details_temporary in the database. The aforementioned code will give the following output: stu_id stu_firstName stu_lastName 1 Preet Sanghavi 2 Rich John 3 Veron Brow 4 Geo Jos 5 Hash Sh...
mysql创建表 create table select ###MySQL学习笔记 ###一,学习目标 1.进行复杂度较高的数据交换业务处理 2.灵活的操作数据库中的数据 3.掌握数据库设计技能 ###二,初识MySQL ###2.1 本章任务 1.使用SQL语句创建数据库myschool 2.使用SQL语句创建学生表student 3.使用...
Python MySQL - Table with Primary KeyAs we had created a table named students in our database, in which we will store student data and fetch it whenever required. But while fetching data, we might find students with same name and that can lead to wrong data getting fetched, or cause ...