Skip to main content
Define DDL and DML in my mysql?
Define DDL, DML commands
DDL
Data Definition Language (DDL) statements are used to define the database structure or schema.
examples are:
- CREATE - to create objects in the database
- ALTER - alters the structure of the database
- DROP - delete objects from the database
- TRUNCATE - remove all records from a table, including all spaces allocated for the records are removed
- COMMENT - add comments to the data dictionary
- RENAME - rename an object
DML
Data Manipulation Language (DML) statements are used for managing data within schema objects.
examples are:
- SELECT - retrieve data from the a database
- INSERT - insert data into a table
- UPDATE - updates existing data within a table
- DELETE - deletes all records from a table, the space for the records remain
- MERGE - UPSERT operation (insert or update)
- CALL - call a PL/SQL or Java subprogram
- EXPLAIN PLAN - explain access path to data
- LOCK TABLE - control concurrency
Comments
Post a Comment