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sql学习记录
sql学习记录
SQL学习记录
参加笔试的时候还没有
学习
过
SQL
,木有做出来=2017/9/13 这几天
学
了下python,附上上面数据库查询的python实现(插入代码中居然没有python选项。import sqlite3#create db conn=sqlite3.connect('shop.db')#achieve db cursor cu=conn....
SQL
查询
学习记录
and(select top 1 len(username)from Admin)>0 其中top语句用来返回要规定
记录
的数目。如果top 1的username长度大于0,则条件成立;接着就是>1、>2、>3这样测试下去,一直到条件不成立为止,比如>7成立,>8不成立,就是len(username)=8 2 ...
Mysql_
学习记录
前言 本篇博客主要
记录
一些开发中使用的到一些知识点。正文 第一篇 CDATA语法![CDATA[]]>这是一个xml语法 是的所有在CDATA中的数据都不会被解析 详细描述参见:CDATA语法 第二篇 CONCAT函数 CONCAT()函数用于将多个字符串连接成一个字符...
MySQL
学习记录
系列(五)
MySQL
学习记录
系列(五)目录1、MySql中常用工具 1.1、mysql 1.2、mysqladmin 1.3、mysqlbinlog 1.4、mysqldump 1.5/mysqlimport/source 1.6、mysqlshow2、Mysql日志 2.1、错误日志 2.2、二进制日志 2.3、查询日志 2.4、慢查询日志1、...
Apache Phoenix
学习记录
(
SQL
on HBase)
当能执行这些操作后,说明phoenix功能已经正常整合进现有HBase集群中,您接下来就可以体验HBase之上执行
SQL
功能的奇妙之旅了。3
SQL
特性详解 1)create:可以创建一张表或视图。表名如果没有用双引号括起来,默认都会使用其对应的大写字母...
MySQL
学习记录
系列(六)
MySQL
学习记录
系列(六)目录3、Mysql复制 3.1、复制 3.2、复制原理 3.3、复制优势 3.4、搭建步骤4.1、需求分析 4.3、通过AOP记录操作日志 4.4 日志查询后端代码实现 4.5 日志查询前端代码实现 4.6 联调测试 4.7 分析性能问题 4.8 性能...
MySQL
学习记录
系列(一)
2.2、索引优势劣势优势:1)类似于书籍的自
录
索引,提高数据检索的效率,降低数据库的IO成本。2)通过索引列对数据进行排序,降低数据排序的成本,降低CPU的消耗。劣势:1)实际上索引也是一张表,该表中保存了主键与索引字段,并指向实体...
MySQL
学习记录
系列(二)
所以在创建视图的时候,主要的工作就落在创建这条
SQL
查询语句上。视图相对于普通的表的优势主要包括以下几项:.简单:使用视图的用户完全不需要关心后面对应的表的结构、关联条件和筛选条件,对用户来说已经是过滤好的复合条件的结果集....
MySQL
学习记录
系列(四)
MySQL
学习记录
系列(四)目录1、应用优化 1.1、使用连接池 1.2、减少对MySQL的访问 1.3、负载均衡2.Mysql中查询缓存优化 2.1、概述 2.2、操作流程 2.3、查询缓存配置 2.4、开启查询缓存 2.5、查询缓存SELECT选项 2.6、查询缓存失效的情况3...
MySQL
学习记录
系列(三)
MySQL
学习记录
系列(三)目录1、MySQL体系结构2、存储引擎 2.1、官网简介 2.2、各种存储引擎特性 2.3、存储引擎的选择3、优化
SQL
步骤 3.1、查看
SQL
执行频率 3.2、定位低效率执行
SQL
3.3、explain分析执行计划 3.4、show profile分析
SQL
...
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立即查看
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云数据库RDS SQL Server版
云数据库SQL Server,具有企业许可授权,权限更为开放,引擎功能更为强大。能完美支持Windows平台的.NET架构,支持复杂SQL查询,性能优秀,并有强大的可视化管理工具,帮助您轻松管理数据。
产品详情
管理控制台
在线咨询
最新活动
新用户购1年享2折优惠
数据库专场优惠
快速入门
帮助文档
入门指南
最佳实践
基于HBR云上统一备份
数据库客户案例合集
产品推荐
数据管理DMS
数据库备份DBS
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立即查看
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云数据库RDS SQL Server版
云数据库SQL Server,具有企业许可授权,权限更为开放,引擎功能更为强大。能完美支持Windows平台的.NET架构,支持复杂SQL查询,性能优秀,并有强大的可视化管理工具,帮助您轻松管理数据。
产品详情
管理控制台
在线咨询
最新活动
新用户购1年享2折优惠
数据库专场优惠
快速入门
帮助文档
入门指南
最佳实践
基于HBR云上统一备份
数据库客户案例合集
产品推荐
数据管理DMS
数据库备份DBS