Or database design language, data design language. A language, usually a part of a database management system, that defines all attributes and properties of a database, especially record layouts, field definitions, key fields (and, sometimes, keying methodology), file locations, and storage strategy.
data definition language. The data definition part of the structured query language (SQL). OracleAS TopLink Mapping Workbench can generate DDL creation scripts that can be used to create tables on the desired database.
Data Definition Language. This is the syntax that a given DBMS understands, and is used to manipulate the structure of the database, from initial database creation to additions, modifications and deletions of all database objects (tables, columns, indexes etc.) to the eventual removal of the database. Another term used for DDL is 'schema'. Because each DBMS is slightly different, the DDL statements that each use is also different, sometimes completely alien to each other.
DDL Data Definition Language. A language used by a database management system which allows users to define the database, specifying data types, structures and constraints on the data. Examples are the CREATE TABLE, CREATE , ALTER, and DROP statements. Note: DDL statements will implicitly commit any outstanding transaction.
A language enabling the structure and instances of a database to be defined in a human and machine readable form. SQL contains DDL commands that can be used either interactively or within programming language source code to define databases and their components.
Those statements in SQL that define, as opposed to manipulate, data. The schema of a database is created or modified with DDL. For example, CREATE TABLE, CREATE INDEX, GRANT, and REVOKE are SQL DDL statements.
digital driving level. A digital value which given as input to a display system produces a luminance. The set of DDLs of a display system is all the possible discrete values that can produce luminance values on the display system. The mapping of DDLs to luminance values for a display system produces the characteristic curve of that display system. The actual output for a given DDL is specific to the display system and is not corrected for the grayscale standard display function.
Digital Delay Line. Similar to analogue delay except that the effect is achieved by means of digital circuitry. This involves converting signals to digital impulses, which can be recreated any number of times to produce the delay.