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...
SQL语句分类 1.DDL(Data Definition Language)数据定义语言 用来定义数据库对象:数据库,表,列等。关键字:create,drop,alter等 2.DML(Date Manipulation Language)数据操作语言 用来对数据库中表的数据进行增删改查。关键字:insert,delete.update等 3.DQL(Data Query Language)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 commitme...
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 ...
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 ...
AgentArtifactDefinition AgentArtifactType AgentBasedDeployPhase AgentChangeEvent AgentDeploymentInput AgentJobRequestMessage AgentPoolEvent AgentPoolQueue AgentPoolQueueReference AgentPoolQueueReference AgentPoolQueueTarget AgentQueueEvent AgentQueuesEvent AgentRefreshMessage AgentSpecification AgentSpecification AgentStatus...
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...
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...