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Give detail description on Transactions.
- Using transactions we can group all SQL commands into a single unit.
- Transaction begins with some task and finishes only when all tasks within it are over.
- Transaction gets over successfully only when all commands in it are successfully over. Even if one command fails, whole transaction fails.
- BEGIN TRANSACTION, ROLLBACK TRANSACTION, and COMMIT TRANSACTION statements are used to work with transactions.
- A group of tasks starts with begin statement.
- Just in case of any problem, rollback command is executed to abort transaction.
- If all tasks run successfully, all commands are executed through commit statement.
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
brief history,definition,current trends and future trends if any of data fragmentation
create an e-r diagram usuing graphical dipicted software that could theoritically be used in resturant application
The scenario You have been approached to design and implement a prototype of a distributed information system for a national car part retail outlet chain. The company comprises
Need 2 projects completed in 3NF format.
external and internal mapping with examples
What is meant by software and hardware RAID systems? RAID can be executed with no change at the hardware level, using only software modification. Such RAID implementations are
What is a foreign key, and what is it used for? A foreign key is used to establish relationships between relations in the relational model. Technically, a foreign key is a colu
Problem : AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op
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