A method in which records are physically stored in a specified order according to a key field in each record is hash.(In hash method,a hash function is performed on the key value to determine the unique physical address of the record to store or retrieve)
Databases MCQ - Relational model
A subschema expresses the external view. (External schemas are called also called as subschemas)
- A The data dictionary is normally maintained by the database administrator.
- B Data elements in the database can be modified by changing the data dictionary.
- C Data elements in the database can be modified by changing the data dictionary.
- D The data dictionary is a tool used exclusively by the database administrator.
