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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
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
definition and its work
discuss the array implementation of a stack.
Give the forms of triggers? The triggering event can be insert or delete. For updated the trigger can state columns. The referencing old row as clause The referencing
explain at least five widly used case tools
what factors might influence a company to outsource its IT infrascture.
1. Explain different addressing modes of 8086 Explanation of all addressing modes 2. Write a sequence of instructions to exchange two register contents using stack
What is meant by Physical blocks? The input and output operations are completed in block units. The blocks residing on the disk are referred to as physical blocks.
joins
The Incident table, with an auto-incrementing incident number, etc, looks like: incident_num reporter date time incide
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