DML (Data Manipulation Language) - definition
DML (Data Manipulation Language) - definition
DML (Data Manipulation Language) is a subset of SQL (Structured Query Language) for operations on data stored in relational databases. Its main purpose is to allow the user to add, modify, delete and read records in tables without interfering with the structure of the database itself. DML operates at the level of content rather than schema definition and therefore plays a key role in the day-to-day use of database management systems.
DML instructions are executed in a transactional context, meaning that changes made using them can be approved (commit) or rolled back (rollback), ensuring data integrity even in multi-user environments. These operations are fundamental to the integrity and timeliness of information in information systems, and their correct use is important in the design of applications using databases.
The DML language allows precise filtering of data using logical conditions and comparison operators, supporting the creation of dynamic and flexible queries. Its syntax is designed to reflect the natural language of end-user queries, facilitating the work of database administrators and developers alike.
In the context of relational databases, DML often co-exists with other subsets of SQL, such as DDL (Data Definition Language), responsible for creating and modifying data structures, and DCL (Data Control Language), which manages access permissions. The role of DML, however, focuses exclusively on the manipulation of the data itself, making it one of the most operational and practical tools in the day-to-day operation of database systems.
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