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数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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数据库SQL学习笔记(一) - 耕耘 - 爱码网
一 常用操作:
退出: 在你成功地连接后,你可以在mysql> 提示下打入 QUIT 随时断开: mysql> QUIT ;
创建数据库 命令:CREATE DATABASE < 数据库名 > 例如,建立一个名为 test 的数据库 mysql> CREATE DATABASE test;
删除数据库 命令: DROP DATABASE < 数据库名 > 例如,删除名为 test 的数据库 mysql> DROP DATABASE test;
连接数据库
命令: USE < 数据库名 > 例如,如果test 数据库存在,尝试存取它: mysql> USE test ; 屏幕提示: Database changed
建表 命令:CREATE TABLE < 表名 > ( < 字段名 1> < 类型 1> [,..< 字段名 n> < 类型 n>]);
例如,建立一个名为table_1 的表,此表记录班上的人员及平均成绩,那么用字段 id 代表编号,为数字类型,且编号唯一,不能为空 , 缺省值为 0 ; 用字段 name 代表人名,为字符型,不为空;用字段 degree 代表成绩,为数字型,可为空。编号 id 为此表的关键字。建表如下: mysql> CREATE TABLE table_1 ( > id INT(4) DEFAULT \'0\' NOT NULL, > name CHAR(20) NOT NULL , > degree DOUBLE(16,2) , > PRIMARY KEY(id)); //每个变量后用,号隔开 每条语句用;号结束。
删除表
命令:DROP TABLE < 表名 > 例如,删除表名为 table_1 的表 mysql> DROP TABLE table_1;
MYSQL>DROP INDEX Stusname ON Student;
插入数据
命令:INSERT INTO < 表名 > [( < 字段名 1>[,..< 字段名 n > ])] VALUES ( 值 1 )[, ( 值 n )] 例如,往表 test 中插入二条记录 , 这二条记录表示:编号为 1 的名为 joan 的成绩为 96.45, 编号为 2 的名为 jeanny 的成绩为 82.99. mysql> INSERT INTO test VALUES(1,\'joan\',96.45),(2,\'jeanny\',82.99);
查询表中的数据 命令: SELECT < 字段 1 ,字段 2 , ...> FROM < 表名 > WHERE < 表达式 > 例如,查看表 test 中所有数据 mysql> SELECT * FROM test;
屏幕显示:
+----+-------------+----------+ | id | name | degree | +----+-------------+----------+ | 1 | joan | 96.45 | | 2 | jeanny | 82.99 | +----+-------------+----------+
b
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删除表中数据
一删除一个元组: 命令: DELETE FROM < 表名 > WHERE < 表达式 > 例如,删除表 test 中编号为 1 的记录 mysql> DELETE FROM test WHERE id=1;
二 字段类型:
1. INT[(M)]
正常大小整数类型
2. DOUBLE[(M,D)] [ZEROFILL]
正常大小( 双精密 ) 浮点数字类型
3. DATE
日期类型。支持的范围是1000-01-01 到 9999-12-31 。 MySQL 以 YYYY-MM-DD 格式来显示 DATE 值,但是允许你使用字符串或数字把值赋给 DATE 列
4. CHAR(M )
定长字符串类型,当存储时,总是是用空格填满右边到指定的长度
5. BLOB TEXT
BLOB或 TEXT 类型,最大长度为 65535(2^16-1) 个字符。
6. VARCHAR
三 变长字符串类型:
1: 显示数据库 SHOW DATABAS,
2:当前选择的数据库,
mysql> SELECT DATABASE(); +------------+ | DATABASE() | +------------+ | test ; +------------+ | DATABASE() | +------------+ | test | +------------+
3: 当前数据库包含的表信息:
mysql> SHOW TABLES; +---------------------+ | Tables in test mysql> SHOW TABLES; +---------------------+ | Tables in test | +---------------------+ | mytable1 | | mytable2 | +---------------------+
4: 获取表结构
mysql> desc mytable1; +---------+-------------+------+-----+---------+-------+ | Field mysql> desc mytable1; +---------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------+-------------+------+-----+---------+-------+ | s1 | varchar(20) | YES |NULL | | +---------------------+------+-----+---------+-------+
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