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sql笔记差异分析
sql笔记差异分析
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(四)
数据库之间数据迁移的时候,首先是迁移数据,然后就是
SQL
、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试,写了一些
SQL
以及数据库对象转换方面的文章,不足之处,尚请多多指教。1、NLSSORT Oracle...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(六)
数据库之间数据迁移的时候,首先是迁移数据,然后就是
SQL
、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试,写了一些
SQL
以及数据库对象转换方面的文章,不足之处,尚请多多指教。1、NVL2 NVL2(expr1...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(一)
数据库之间数据迁移的时候,首先是迁移数据,然后就是
SQL
、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试,写了一些
SQL
以及数据库对象转换方面的文章,不足之处,尚请多多指教。1、NULL判断函数 ...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(七)
Oracle只支持截取年、月、日、时、
分
、秒,时区时,时区分、时区等。PostgreSQL也支持该函数,截取的东西比Oracle的多一些,但是不支持时区时,时区分和时区的截取(文档中说是支持的,但是我的实际测试中不支持)。Oracle EXTRACT
SQL
>...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(三)
数据库之间数据迁移的时候,首先是迁移数据,然后就是
SQL
、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试,写了一些
SQL
以及数据库对象转换方面的文章,不足之处,尚请多多指教。1、substr substr...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(五)
数据库之间数据迁移的时候,首先是迁移数据,然后就是
SQL
、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试,写了一些
SQL
以及数据库对象转换方面的文章,不足之处,尚请多多指教。1、regexp_replace ...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之一:外连接
下面利用下面的表数据
分析
一下Oracle的这种外连接的写法和转换的方式。
SQL
>select*from employ;ID NAME AGE ADDR-1 赵大 20 山东济南 2 钱二 20 山东青岛 4 李四 20 山东济南 5 周五 20 山东日照
SQL
>select*from salary;EMPID YYMM SALARY...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之五:函数的差异(二)
数据库之间数据迁移的时候,首先是迁移数据,然后就是
SQL
、存储过程、序列等程序中不同的数据库中数据的使用方式的转换。下面根据自己的理解和测试,写了一些
SQL
以及数据库对象转换方面的文章,不足之处,尚请多多指教。1、to_number函数 ...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之二:序列的使用
下面
分析
一下它在Oracle数据库和PostgreSQL数据库中的一些异同。1、序列的一些属性 Oracle的序列创建的时候,可以指定起始值(start with),最大值(maxvalue,默认是10^28),最小值(minvalue,默认1),每次自增值(increment by)、是否使用...
《卸甲
笔记
》-PostgreSQL和Oracle的
SQL差异分析
之三:rownum和聚合函数
Oracle中,把检索结果取出来后,在画面上
分
页显示的功能,都是使用rownum,并且使用多层子查询来实现的。PostgreSQL中,没有rownum这样的伪列,但是提供了 limit 和 offset 两个关键字来实现类似的功能。limit表示取得记录的条数。而 ...
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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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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