Was sind DDL Statements?
Die Data Definition Language (DDL; deutsch Datendefinitionssprache) ist eine Datenbanksprache, die verwendet wird, um Datenstrukturen und verwandte Elemente zu beschreiben, zu ändern oder zu entfernen. XML Schema ist eine DDL zur Beschreibung der Struktur von XML-Dokumenten.
Welche SQL gibt es?
Übersicht von relationalen Datenbankmanagementsystemen
| Name | Entwickler | Erscheinungsjahr |
|---|---|---|
| Microsoft SQL Server | Microsoft | 1989 |
| MySQL | MySQL AB, Sun Microsystems, Oracle | 1995 |
| Oracle | Oracle | 1979 |
| PostgreSQL | PostgreSQL Global Development Group | 1996 |
What are DDL commands in SQL?
A DDL is a language used to define data structures and modify data. For example, DDL commands can be used to add, remove, or modify tables within in a database. DDLs used in database applications are considered a subset of SQL, the Structured Query Language.
What are DDL statements in SQL?
DDL Statements [Oracle] DDL stands for data definition language. DDL statements are SQL Statements that define or alter a data structure such as a table. Hence, a typical DDL statement is create table or alter table.
What does DDL stand for?
DDL stands for Data Definition Language which is used for creating tables relationships and other database structures (Kroenke & Auer). DDL is a set of commands that can manupulate tables, indexes and other properties in a database.
What are DDL and DML commands in SQL with examples?
DDL Commands: DDL means Data Definition Language. It is used to create and modify the structure of database objects in SQL.