Data Definition Language The SQL data-definition language (DDL)allows the specification of information about relations,including: The schema for each relation. The type of values associated with each attribute. The Integrity constraints The set of indices to be maintained for each relation. Security and authorization information for each relation. The physical storage structure of each relation on disk. Database System Concepts-7th Edition 3.5 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 3.5 ©Silberschatz, Korth and Sudarshan th Edition Data Definition Language ▪ The schema for each relation. ▪ The type of values associated with each attribute. ▪ The Integrity constraints ▪ The set of indices to be maintained for each relation. ▪ Security and authorization information for each relation. ▪ The physical storage structure of each relation on disk. The SQL data-definition language (DDL) allows the specification of information about relations, including: