事务控制语言 (Transaction Control Language, TCL) 用于管理数据库中的事务。这些用于管理由 DML 语句所做的更改。它还允许将语句分组为逻辑事务。 TCL 的核心指令是COMMIT、ROLLBACK。 数据控制语言(DCL) 数据控制语言 (Data Control Language, DCL)是一种可对数据访问权进行控制
SQL statements are the means by which programs and users access data in an Oracle database. The sections that follow show each SQL statement and its related syntax. Refer toSubclausesfor the syntax of the subclauses listed in the syntax for the statements. ...
You can create an SQL query file, write SQL query statements, and then commit the SQL query statements to a specific data source for execution. Create an SQL query file. Manually create an SQL query file. In the left-side navigation pane of the SQL Query page, move the pointer over the...
Control statements are the programming statements that make PL/SQL a full procedural complement to SQL.
Cached data dictionary information and Shared SQL and PL/SQL areas for SQL statements, stored procedures, function, packages, and triggers. This statement does not clear shared SQL and PL/SQL areas for items that are currently being executed. You can use this clause regardless of whether you...
Concurrency Control restricts the execution of SQL statements based on specified rules when there are SQL statements that cannot be optimized timely or a resource (for ex
Step 8 - During a transaction, the data is in lock mode. This is guaranteed by the lock manager. It also ensures the transaction’s ACID properties. Visualizing a SQL query SQL statements are executed by the database system in several steps, including: Parsing the SQL statement and checking...
事务控制语言 (Transaction Control Language, TCL) 用于管理数据库中的事务。这些用于管理由 DML 语句所做的更改。它还允许将语句分组为逻辑事务。 TCL 的核心指令是 COMMIT、ROLLBACK。 数据控制语言(DCL) 数据控制语言 (Data Control Language, DCL) 是一种可对数据访问权进行控制的指令,它可以控制特定用户账户对...
A trigger is a series of Transact-SQL statements associated with a SQL Server table. A table can have three triggers, one for each of the commands that can modify data in a table: the UPDATE, INSERT, and DELETE commands. The trigger is automatically...
若要为数据库启用 Stretch Database,需要 db_owner 和CONTROL DATABASE 权限。 SERVER = <server_name> 指定Azure 服务器的地址。 包括名称的 .database.windows.net 部分。 例如,MyStretchDatabaseServer.database.windows.net。 CREDENTIAL = <db_scoped_credential_name> 指定SQL Server 实例用于连接到 Azure ...