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What is NULL? Give an example to described testing for NULL in SQL?
The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:
Person(id, name, address, phone)Now to search ids and names of person who do not have a phone is: Select id, name from Person where phone is null
Define Two phase commit Two phase commit: To make sure atomicity, all the sites where a transaction is being executed must agree on the final outcome of the execution. The tran
Construct a generalization-specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles that comprise an engine number and cost; cars that have a chass
What is DML compiler? DML Compiler: Translates DML statements in a query language within low level instructions understandable through the query evaluation engine. Attempts to
Explain Stand Alone Query Language in details? Stand alone Query Language - The query language that can be used interactively is known as stand alone query language. It does no
In the architecture of a database system which external level used? In the architecture of a database system view external level used.
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
1. Determine that the Checkpoints are a part of Ans: Checkpoints are a part of Recovery measures
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
Benefits of using heuristics
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