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DCL commands are used for access control and permission management for users in the database. With them we can easily allow or deny some actions for users on the tables or records (row level security). DCL commands are: GRANT We can give certain permissions for the table (and other objects) for specified groups/users of a database. DENY
Although not in standard, most DBMS allows using a select clause without a table by pretending that an imaginary table with one row is used. This is mainly used to perform calculations where a table is not needed. The SELECT clause specifies a list of properties (columns) by name, or the wildcard character (“*”) to mean “all properties”.
A derived table is the use of referencing an SQL subquery in a FROM clause. Essentially, the derived table is a subquery that can be selected from or joined to. The derived table functionality allows the user to reference the subquery as a table. The derived table is sometimes referred to as an inline view or a subselect.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
A savepoint is a way of implementing subtransactions (also known as nested transactions) within a relational database management system by indicating a point within a transaction that can be "rolled back to" without affecting any work done in the transaction before the savepoint was created. Multiple savepoints can exist within a single ...
A grant table is an interface which grants access to memory pages to Virtual Machines that do not own the pages. [1] Grant tables are implemented on Xen hypervisor.
Other kinds of access points contain information such as title words, classification codes, indexing terms ,etc. They are termed subject access points. [1] However, a subject access point is defined as any access point useful for subject searching. There is no precise border between descriptive access points and subject access points. In theory ...
Robert E. Lee: Civil War General is a 1996 computer wargame developed by Impressions Games and published by Sierra On-Line.Set during the American Civil War, it tasks the player with leading the Confederate Army of Northern Virginia to victory against the Union Army of the Potomac.