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Define Join and Outer Join and differentiate between them.
Ans: Join - It generates all the combinations of tuples from two relations which satisfy a join condition. Outer Join - If there are any type of values in one table that do not have corresponding value(s) in the other, in an equi-join which will not be selected. Such rows can be forcefully selected through using the outer join. The corresponding columns for that row will comprise NULLs. There are in fact three forms of the outer-join operation: left outer join, right outer join and full outer join.
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What is the use of Union and intersection operation? Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuple
explain normalisation
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.
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
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i am required to come up with entities relationships, optionality and cardinality from a scenario. there is a night club and bookings for a musician band
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