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oracle 常用语言

Jun 07, 2016 pm 03:08 PM
oracle sql client Commonly used develop language

在Oracle开发中,客户端把SQL语句发送给服务器,服务器对SQL语句进行编译、执行,把执行的结果返回给客户端。 Oracle SQL语句由如下命令组成: 数据定义语言(DDL),包括CREATE(创建)命令、ALTER(修改)命令、DROP(删除)命令等。 数据操纵语言(DML)

在Oracle开发中,客户端把SQL语句发送给服务器,服务器对SQL语句进行编译、执行,把执行的结果返回给客户端。

Oracle SQL语句由如下命令组成:
 数据定义语言(DDL),包括CREATE(创建)命令、ALTER(修改)命令、DROP(删除)命令等。
 数据操纵语言(DML),包括INSERT(插入)命令、UPDATE(更新)命令、DELETE(删除)命令、SELECT … FOR UPDATE(查询)等。
 数据查询语言(DQL),包括基本查询语句、Order By子句、Group By子句等。
 事务控制语言(TCL),包括COMMIT(提交)命令、SAVEPOINT(保存点)命令、ROLLBACK(回滚)命令。
 数据控制语言(DCL),GRANT(授权)命令、REVOKE(撤销)命令。

目前主流的数据库产品(比如:SQL Server、Oracle)都支持标准的SQL语句。
数据定义语言,表的增删改操作,数据的简单查询,事务的提交和回滚,权限的授权和撤销等,Oracle与SQL Server在操作上基本一致。

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