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In SQL, you can alias tables and columns. A table alias is called a correlation name, according to the SQL standard. [1] A programmer can use an alias to temporarily assign another name to a table or column for the duration of the current SELECT query. Assigning an alias does not actually rename the column or table.
Oracle Net, [3] a proprietary networking stack, runs both on client devices and on Oracle database servers in order to set up and maintain connections and messaging between client applications and servers. Oracle Net (formerly called "SQL*Net" or "Net8" [4]) comprises two software components: Oracle Net Foundation Layer: makes and maintains ...
Oracle Forms 3 was the first version to allow PL/SQL to be used within Forms triggers and procedures/SQL Functions could also be used as an undocumented feature. Forms 3 was a character mode application and was primarily used in terminals such as Digital VT220 and PCs running Microsoft DOS.
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Microsoft SQL Server: SQL Server does not require a dummy table. Queries like 'select 1 + 1' can be run without a "from" clause/table name. [5] MySQL allows DUAL to be specified as a table in queries that do not need data from any tables. [6] It is suitable for use in selecting a result function such as SYSDATE() or USER(), although it is not ...
Name UTC offset ACDT: Australian Central Daylight Saving Time: UTC+10:30: ACST: Australian Central Standard Time: UTC+09:30: ACT: Acre Time: UTC−05:00: ACT: ASEAN Common Time (proposed) UTC+08:00: ACWST: Australian Central Western Standard Time (unofficial) UTC+08:45: ADT: Atlantic Daylight Time: UTC−03:00: AEDT: Australian Eastern Daylight ...
PL/SQL refers to a class as an "Abstract Data Type" (ADT) or "User Defined Type" (UDT), and defines it as an Oracle SQL data-type as opposed to a PL/SQL user-defined type, allowing its use in both the Oracle SQL Engine and the Oracle PL/SQL engine. The constructor and methods of an Abstract Data Type are written in PL/SQL.
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...