DML is abbreviation of Data Manipulation Language. It is used to retrieve, store, modify, delete, insert and update data in database. DDL is abbreviation of Data Definition Language. It is used to create and modify the structure of database objects in database.
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Data Manipulation Language (also known as DML) is a family of computer languages. They are used by computer programs, and/or database users, to manipulate data in a database – that is, insert, delete and update this data in the database.
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Data Definition Language (also known as DDL) is a computer language used to define data structures – as its namesake suggests. It first made its appearance in the CODASYL database model (a model pertaining to the information technology industry consortium, known as Conference on Data Systems Languages).