Data Manipulation Language (DML) Language for accessing and manipulating the data organized by the appropriate data model DML also known as query language Two classes of languages Pure-used for proving properties about computational power and for optimization Relational Algebra Tuple relational calculus Domain relational calculus Commercial -used in commercial systems SQL is the most widely used commercial language Database System Concepts-6th Edition 1.14 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 1.14 ©Silberschatz, Korth and Sudarshan th Edition Data Manipulation Language (DML) Language for accessing and manipulating the data organized by the appropriate data model DML also known as query language Two classes of languages Pure – used for proving properties about computational power and for optimization  Relational Algebra  Tuple relational calculus  Domain relational calculus Commercial – used in commercial systems  SQL is the most widely used commercial language