In this article, we’ve explored the different categories of SQL commands: DDL, DML, DCL, and TCL, and their respective functionalities. Understanding these categories is essential for effectively managing and manipulating databases. With the appropriate commands, we can ensure data integrity, security...
It is important to note that since all data is not being written to transaction logs, it is impossible to use transactional control (ROLLBACK, for example) to recover the deletion performed by theTRUNCATEcommand. In other words, truncated data is permanently removed. What Do SQL DDL Scripts C...
SQL is classified into the following categories. Note that statements mentioned in the following tables may vary in different databases. CommandsDescription DDL Data Definition Language DML Data Manipulation Language TCL Transaction Control Language DCL Data Control Language ...
A free graphical user interface, Oracle SQL Developer allows database users and administrators to do their database tasks in fewer clicks and keystrokes. A productivity tool, SQL Developer's main objective is to help the end user save time and maximize the return on investment in the Oracle Da...
旁路导入可以绕过 SQL 层的接口,在 data 文件中直接分配空间并插入数据,从而提高数据导入的效率。在 V4.3.0 版本开始,列存表也支持旁路导入数据。 更多信息,参见官网文档旁路导入概述。 新向量化引擎 OceanBase 在 V4.3.0 版本实现了新向量化引擎,更改为 Column 数据格式描述,同时也对一批常用算子和表达式进行了...
Structured Query Language (SQL) is a standardized programming language that is used to managerelational databasesand perform various operations on the data in them. Initially created in the 1970s, SQL is regularly used not only by database administrators but also by developers writing data integratio...
A free graphical user interface, Oracle SQL Developer allows database users and administrators to do their database tasks in fewer clicks and keystrokes. A productivity tool, SQL Developer's main objective is to help the end user save time and maximize the return on investment in the Oracle Da...
For information about availability groups on Linux, see Availability groups for SQL Server on Linux.In an HA configuration, a cluster role is created for every availability group that you create. The WSFC cluster monitors this role to evaluate the health of the primary replica....
请参阅 Free supported Java in SQL Server 2019 is now available(SQL Server 2019 现已提供免费支持的 Java)。 SQL Server 语言扩展 使用扩展性框架执行外部代码。 请参阅 SQL Server 语言扩展。 注册外部语言 CREATE EXTERNAL LANGUAGE 是一种新的数据定义语言 (DDL),可在 SQL Server 中注册外...
Data Query Language (DQL) is used to get data within the schema objects of a database and also to query it and impose order upon it. Like DDL, DQL is also a subset of SQL. One of the most common commands in DQL isSELECT. It lets users get data from a database table and perform...