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(a) What is a Sub-Query?
(b) What is the difference between a scalar sub-query and a tabular sub-query?
(c) Write an equivalent SQL statement to get the Name of Product which has the same price list as the Chainring Bolts. Use the following relational schema to answer this question: Production.Product (ProductID, PName, ListPrice)
(d) Convert the following SQL Statement to display the same result by using a sub-query instead of the join.
SELECT p.Name, p.ProductNumber FROM Production.Product p JOIN Sales.SalesOrderDetail AS sod ON p.ProductID = sod.ProductID WHERE sod.OrderQty > 41
(e) SQL Server may produce unexpected results when performing calculations on columns that have NULL values. So, to resolve this problem you need to use the ISNULL, NULLIF, and COALESCE functions of SQL Server 2005 when your columns hold NULL values. Explain briefly the purpose of each of the above function and support your answer with an appropriate example.
What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.
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What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
Control Files : The redo and control files logs support the rest of the architecture. Every database must have at least one control file, although you have more than one to guard
1 NF Normal Form The domain of attribute must add only atomic (simple, indivisible) values First normal form (Minimal Form or 1NF) is a normal form need in database normalizat
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