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Define identify relationship?
Identifying relationship: An identifying relationship means in which the child table cannot be uniquely recognize without the parent. For example, you have this situation in the intersection table used to resolve a many-to-many relationship whereas the intersecting table's Primary Key is a composite of the left and right (parents) table's Primary Keys
aggregation
Discuss the mechanism to read data from and write to a disk? Disk read/write heads are mechanisms in which read data from or write data to disk drives. The heads have gone by
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
What is a block and a block number? A block is a contiguous sequence of sectors from a single track of one platter. Every request specifies the address on the disk to be refere
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
What is Trigger? Trigger: A database trigger is procedural code which is automatically executed in response to specific events on a particular table in a database. Triggers can
Which method is used to key transformation ? A hash method is used to key transformation.
Which product produces the relation that has attributes of R1 and R2 ? Cartesian product produce the relation which has attributes of R1 and R2
HOW MANY TYPES OF VIEWS
explain concept of decomposition?
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