从功能上划分,SQL语言可以分为DDL,DML和DCL三大类。 1. DDL(Data Definition Language) 数据定义语言,用于定义和管理 SQL 数据库中的所有对象的语言 ; CREATE---创建表 ALTER---修改表 DROP---删除表 2. DML(Data Manipulation Language) 数据操纵语言,SQL中处理数据等操作统称为数据操纵语言 ; INSERT---数据...
从功能上划分,SQL语言可以分为DDL,DML和DCL三大类。 1. DDL(Data Definition Language) 数据定义语言,用于定义和管理 SQL 数据库中的所有对象的语言 ; CREATE---创建表 ALTER---修改表 DROP---删除表 2. DML(Data Manipulation Language) 数据操纵语言,SQL中处理数据等操作统称为数据操纵语言 ; INSERT---数据...
从功能上划分,SQL语言可以分为DDL,DML和DCL三大类。 1. DDL(Data Definition Language) 数据定义语言,用于定义和管理 SQL数据库中的所有对象的语言 ; CREATE---创建表 ALTER---修改表 DROP---删除表 2. DML(Data Manipulation Language) 数据操纵语言,SQL中处理数据等操作统称为数据操纵语言 ; INSERT---数据...
COMMIT Restrictions: A commit or rollback in a user-defined function in a secondary thread is not allowed.Commitment definition use: The commitment definition used by SQL is determined as follows: If the activation group of the program calling SQL is already using an activation group level ...
COMMIT Restrictions:A commit or rollback in a user-defined function in a secondary thread is not allowed. Commitment definition use:The commitment definition used by SQL is determined as follows: If the activation group of the program calling SQL is already using an activation group level commitme...
Data Definition Language (DDL) statements are used to define the database structure or schema. Some examples: CREATE - to create objects in the database ALTER - alters the structure of the database DROP - delete objects from the database ...
These are data definition language (DDL) statements – CREATE, ALTER, and DROP for tables and stored routines. 6. Using the SAVEPOINT Statement We may not always want to roll back an entire transaction. SAVEPOINT is an SQL statement that creates a savepoint for a group of SQL statements with...
AgentArtifactDefinition AgentArtifactType AgentBasedDeployPhase AgentChangeEvent AgentDeploymentInput AgentJobRequestMessage AgentPoolEvent AgentPoolQueue AgentPoolQueueReference AgentPoolQueueReference AgentPoolQueueTarget AgentQueueEvent AgentQueueServiceHookEvent AgentQueuesEvent AgentRefreshMessage AgentSpecification Age...
A transaction is a sequence of SQL statements that Oracle treats as a single unit. This statement also erases all savepoints in the transaction and releases the transaction's locks.Note: Oracle issues an implicit COMMIT before and after any data definition language (DDL) statement....
COMMIT Restrictions:A commit or rollback in a user-defined function in a secondary thread is not allowed. Commitment definition use:The commitment definition used by SQL is determined as follows: If the activation group of the program calling SQL is already using an activation group level commitme...