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Give the general form of SQL query?
Select A1, A2............., An
From R1, R2..............., Rm
Where P
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
Explain the disadvantages of file oriented approach? In the oriented approach Applications are designed in isolation. Design of application is optimized for one application. In
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Explain mechanism of nested queries? SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common u
Define a relation ? Relation - A relations is a named two-dimensional table of data. Mathematically, a relation can be described as a subset of the cartesian product of a lis
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
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