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Why are cursors necessary in embedded SQL?
A cursor is an object used to store the output of a query for row-by-row processing through the application programs. SQL statements operate on a set of data and return a set of data. Instead, host language programs operate on a row at a time.
The cursors are used to navigate by a set of rows returned through an embedded SQL SELECT statement. A cursor could be compared to a pointer.
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
Problem 1. Describe the following a) Advantages of Database Systems b) Functions of a DBMS Explanation of part (a) and (b) 2. Explain the following concepts w
Define an abstraction by which relationships are treated as higher level entities Ans: Aggregation. It is an abstraction by which relationships are treated as higher level
What is theta join explain? Theta Join - The theta join operation is an extension to the natural-join operation which permits us to merge selection and a Cartesian
what is bogus empowerment. And what is genuine empowerment
For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att
Explain the functions of data manager? Functions of Data Manager : - Convert operations in user's queries coming directly through query processor or indirectly in an applicatio
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
Explain three main attributes of data.
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