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Saving a ddl file in Oracle SQL Developer. In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices, and users. DDL statements are similar to a computer programming language for defining data structures, especially database schemas.
These sub-languages are mainly categorized into four categories: a data query language (DQL), a data definition language (DDL), a data control language (DCL), and a data manipulation language (DML). Sometimes a transaction control language (TCL) [ 1 ] is argued to be part of the sub-language set as well.
HCI—Human—Computer Interaction; HD—High Density; HDD—Hard Disk Drive; HCL—Hardware Compatibility List; HD DVD—High Definition DVD; HDL—Hardware Description Language; HDMI—High-Definition Multimedia Interface; HECI—Host Embedded Controller Interface; HF—High Frequency; HFS—Hierarchical File System; HHD—Hybrid Hard Drive
Data definition language or data description language, relating to databases; Description Definition Language, part of the MPEG-7 standard; Device Description Language, related to field devices for process and factory automation; Digital data logger, a type of data logger, an electronic device that records data over time or in relation to location
In software, a data access object (DAO) is a pattern that provides an abstract interface to some type of database or other persistence mechanism.By mapping application calls to the persistence layer, the DAO provides data operations without exposing database details.
The software engineering community uses an architecture description language as a computer language to create a description of a software architecture. In the case of a so-called technical architecture , the architecture must be communicated to software developers; a functional architecture is communicated to various stakeholders and users.
In SQL, the data manipulation language comprises the SQL-data change statements, [3] which modify stored data but not the schema or database objects. Manipulation of persistent database objects, e.g., tables or stored procedures, via the SQL schema statements, [3] rather than the data stored within them, is considered to be part of a separate data definition language (DDL).
Special-purpose computer languages have always existed in the computer age, but the term "domain-specific language" has become more popular due to the rise of domain-specific modeling. Simpler DSLs, particularly ones used by a single application, are sometimes informally called mini-languages.